StackOverflow is one of the most helpful community I have come across the Internet and I am an active user. I ask questions at times and try to answer whatever I can. Most of my doubts are answered on SO because someone might have already hit that bump before.

When I answer questions on SO, I never think about earning via my answer because it doesn't make sense. Most people answer on the website for the simple reason of helping someone out. If I don't answer thinking that I won't get anything out of it, then someone else will answer for sure.

I feel that monetizing a part of SO will take away a lot of fun for people like me.