I don't like this. It seems you've been duped somewhat by the oft-stated 'one million users +'. The reality is it's 1 mill + accounts. But the vast, vast majority of those are bots and dead users. You're appealing to more like 20,000 users that are actually active at least once this month.

I also dislike the reputation concept. There are some nasty troll-like people with a reputatioin of over 70. Indeed haejin (rep 80) is the highest and only because he is constantly upvoted by a single other account, likely himself. Each post gets roughly 5 comments and slmost everybody feels hee's a waste of bandwidth. Yet he will get the largest reward?

To be c lear, the reputation system is very broken, and the active user claim is untrue