How about if a Mod keeps reads a thread with a high amount of popularity and posts, they can give as many points as they think nessicary. (For coming up with such a crowd pleaser, like destroy bob, for instance)
This is foil proof because a Mod can check if the maker puts up way to much posts.
and say, you get more points the more varity of people (a thread with only 4 people posting on it wouldn't get as much as 10 people posting on a thread)