Dan, maybe you can add a HT-type badge (perhaps as a link to their wiki?) for those who adopt-a-wiki. There are a bunch of people who are experts with one specific card, mileage program, hotel chain, etc who aren't hardcore DDFers yet they might take pride in their wiki if it got more exposure.
Personally, I'm trying to maximize the benefits for a few cards and I'm getting flustered digging through 500 messages in each thread so it would be great to see some of these wikis cleaned up...