>It is surprising that suicide cases are so high in places where economic income and education levels are high.

I think it is not so surprising, because in those places there is also a lot of disconnection from community.  

>People in places where the level of wealth is low say, "I haven't enjoyed life yet, I have to live" and don't want to die.

Or, they have stronger bonds of support with the people around them, which gives them reasons to go on, or obligations to go on.