0.00002 BTC per comment/signup/etc is still way too low. Considering sites like
myLot pay around $0.01 per post (sometimes more for quality posts) and pretty much every paid-to-signup site pays between $0.05 - $0.10 per sign up... I know you're going to increase payment more, but you will need to increase it
a lot more if you want your site to be competitive.