You should do challenging riddles every week to give out XXX amount of "points" the harder the riddle or question the more "points" its worth and vice versa. That is one of the many ideas i have for forums. I will pm u if any more come to mind.
P.S the longer the riddle stays the more points its worth. (maximum is 1 week, then the next riddle/question)
Catch you later
Gman21