[mosta]

people aren't going to post a lot of hands of the form: I raised him with no pair, he reraised, and I folded--ie, postings severely underrepresent the amount of early folding going on.

also, I never would hvae moved from 3-6 (where I was winning, somewhat suprizingly to me now) to 20-40 until I learned 1. you can win more money in making your opponent fold than in showing down the best hand (as someone already replied) and 2. you don't need top pair to have the presumptively best hand.