Earn points to limit ads. The more reports you post, the more points you get, and the less ads you see.
For the users who maintain a steady stream of points, turn off ads altogether. The reports must be confirmed by other users to avoid gaming the system by submitting incorrect (fake) reports.
Note that Stack Overflow, a very popular Q&A site for programmers, uses such system. After a certain number of points, there are no ads at all.