I have 851 reputation (top 39% of all users), I have answered 15 questions, about 50% haven't received any points, a few have received a minimal amount, and two

I have 851 reputation (top 39% of all users), I have answered 15 questions, about 50% haven't received any points, a few have received a minimal amount, and two or three have received a bunch of points. My answers are generally to quite niche topics, I have never gone out of my way to answer questions, I typically post an answer when I have invested a good chunk of time to find the solution to something and then see a question about the same issue. I sometimes see questions I could answer (or improve existing answers), but do not provide an answer as I find it hard to justify the time, I feel that if I wanted to rack up points on stackoverflow it wouldn't be that hard to post several answers a day. My reputation has gone up pretty much steadily, for the last three years, with an average of about 3 or 4 posts per year. I am a pretty light user, and being in the top 39%, if anything, surprises me as I could easily imagine being in the top 80%. I find stackoverflow very useful, I work in games development which is quite a broad subject, in an ideal world I'd have very in depth knowledge about hundreds of topics, but in reality stackoverflow allows me to get quick answers to a huge amount of questions/problems, which in turn gives me more time to devote on area which I feel are most important. I haven't noticed stackoverflow going down hill in the time I have used it.