Here are some good ideas...
1. Once you get 5,000 members send each member $1 via paypal.
2. We could have a party night where we all get drunk and post in a thread and then read it the next day when we are hung over.
Seriously though, this is a tough one...
Maybe you can have a contest to see who comes up with the best idea. I know you guys are burnt out on contests but this one might work. After you get some ideas you could even start a poll and let us all vote on the best idea. Sounds like fun!