Iya, saya tulis juga tuh di data profil. ^_^

Yes, that's true, and that's why foreigner need to prove that they're financially sufficient by getting a blocked account around 8700€. This should be enough to cover the average living cost for a year.
(Foreign students are normally a lot richer than most Germans LOL. How many German students has 8700€ in their bank account hahaha).
The student can only withdraw the money around 600-700€ monthly.
However, this amount must be in the bank account again when the time come to renew the visa, that is the standard procedure. ^_^
Whether one meets a very very nice immigration officer who probably doesn't want check your bank account again, that would only rely on your own luck. :-D
To be certain that your visa would be extended, the best option is still studying hard to try staying on schedule and always have sufficient money in this blocked account. :-)
Part time job is naturally a big help, however studying in a foreign language is hard and most students are not geniuses so, one can't work much either if one doesn't want to have a big problem in catching up the class. The drop-out quote in Germany is obviously not so low. :-D

And btw.. yes, this option exist, but mostly they are run by private university, so they would charge tuition fee. :)
If one could obtain the special visa with working permit, one could try applying for a Dual-Studium.
I would write some more about various options available in Germany next time. Just wait. :)

<blockquote>
To be fair, you should mention the "Verwaltungskostenbeitrag" everyone has to pay every semester. Depending on the university, that is 100-300 Euro per semester. 
</blockquote>
<p>
That's <em>exactly</em> what @kobold-djawa has written:
</p>
<blockquote>
By the way, to be more exact it’s actually not completely free because one still has to pay a semester contribution to finance the semester ticket for public transportation, student organisation’s membership fee and some administration fees. The amount is varying between 100 and 300 € per semester.</blockquote>

@jaki01 has given the correct response on my behalf for your first 2 sentences .
And for the rest I would do it my self. ^_^
The vocational training which you just mentioned is not that simple to obtain for foreigner like us, at least not for foreigners coming from non-EU countries.
This form of education would need more than just a student visa, because the working hours one must go through would exceed the limit set by the immigration (I have written about this working hours limitation before, but only in Indonesian language).
For this vocational training one need a special working permit from the relevant "Ministerium", and obtaining such permit is not that easy.
The only departement which open rather bigger opportunity for non-EU citizens are the health care department, because Germany needs more "Krankenpfleger und Altenpfleger o.Ä." :-D. Foreigner are cheaper and easier to be taken advantage of, that's why. Sad but that is the fact. >_<
But for other department like "technique", Germans would always be first priority, then the next come EU-citizens and EEA-citizens, then citizen of the other allies. Foreigner from developing country would normally only get in the line if the boss of the company/institution as the visa sponsor could prove to the immigration and Department of Work, that only this particular foreigner could fill in the position the best, that the company couldn't find better candidate among Germans and EU-citizens available.
So foreigner who could obtain this kind of visum and a position in such vocational school really needs a big big good luck. Most of the time it's because they have studied here, during the study they might do a part time job there so that they have a good relationship with the boss, but unfortunately they failed the study of they just finally find out that university life is not their cup of coffee.
However they couldn't simply change the visa either, but they normally have to go back to their homeland first and apply the new visa from home.
My case is of course an exceptional case, because I'm married to a German, so my visa type was the one which already had gone trough this obstacle, and as a spouse of a German I logically would live together with him and probably need to help him earning money to finance the family, so I would definitely need this working permit :-D . Otherwise, I might increase the probability of my hubby to burden the gorvernment with social support LOL.

Indonesia doesn't have it either. Education is very expensive there and not every citizen could study in the university despite their intelligence, because scholarship programm is also very limited, and mostly they are for graduate programm, there are extremely few for undergraduate programm.

Enak kalau masih kuliah hahaha, banyak diskon pula. Jaman aku masih students, kalau mau ke salon bawa kartu mahasiswa, biar dapat harga students, lumayan lho itu wkwkwkwkk.

Well, unfortunately I'm not sure whether foreign students would be coming more. In general non-EU citizens have to visit "Studienkolleg" (a preparation course) for 2-3 semesters if they want to get their first degree in Germany, and that's the fastest possible. Some might need 4-5 semesters if they need to repeat some classes because of the failed exams. After finishing this course, then they would finally get the right to apply in any university. The problem is, there are very few University that still runs this classes. Saarland has just closed it down last year and now only runs classes for refugees.
This is again part of the tight saving policy.
Welcoming foreign students is not a charity programm at all, but it could actually be a future investment. Studying in Germany is not easy and who would know what kind of role in the society those graduates  would have in the future in the country where they finally settle down.
I wonder if you know that Indonesian 3rd President was an Indonesian genius who has spent his youth studying and few years working in RWTH Aachen. His Son is also inherited his brain quality :-D  and studied in Germany as well. He had once started and led Indonesian national project to produce aeroplane until the stupid politicians stopped the funding. 
What I'm trying to say is: when you're practically grown up or at least spent long time living here in Germany (for example), then you would normally have a special bonding to this place and somehow would be more approachable to Germany when you hold some important project in your own country.
This ex-President of us has obviously special feeling towards Germany so that he came back after retiring and his wife had her cancer treatment here too until her last breath.
Don't you think it's an advantage? Doktoral study would only last 1 to 2 years perhaps, and that's generally not enough to build this special bonding but when one started studying here since graduated from high school, then the lenght of stay is enough to build the feeling.
China is now growing fast, so it would be a good investments too having Chinese citizens studying here.
Have a nice weekend.

Well, if one could get the visa and a place in the university, that is correct.
But the way for getting a visa itself is a big struggle, and not cheap at all. :-D
If you're not rich it's nearly impossible as you need a financial guarantee for the visa, and the amount is huge. :-D
My husband is a German, that makes a big difference.

It's the same story in my country. Where are you living if I may know it?

You're welcome.

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