>How many of us would be here if all we received where likes?

Well, I don't spend time on other social media as I see it as retarded to do things for likes, plus what gets likes is of such low and useless quality, it makes avoiding social media the goal. 

>How many hours would could I justify away from other interests? From family?

I think it might depend on interests. If only doing it for the money, most shouldn't even bother. Those that have tried burn out fast - those that are here for other reasons are able to participate *easily* for years.