C) is that bitcointalk community is a source of living a comfortable live?
Say what? I don't expect that if I asked you to clarify what you meant that you'd even see my post, but how the hell does a discussion forum provide a comfortable life for anyone?
If you look at
this source for example (I am not sure if it's reliable and accurate), and scroll all the way down where it shows several African nations, you would notice that the average monthly income for some of them is between $26 and $100. If a user from those countries managed to get into a signature campaign that paid only $40-$50 weekly, they would be able to lead a more than comfortable life. If they managed to remain part of the campaign for a longer period of course.