Yea, I suppose abuse is possible... especially as the boards have nearly 20,000 users, and most of them have never even posted. It's conceivably possible someone could create 100 new users and boost their own rating with their votes.
I propose perhaps only users with 10 posts or more, and registered 7 days ago, may vote? At least it would make it considerably more difficult to do, and easier to catch. I suppose it would prevent one-time visitors from rating a user who helped them, but ya can't please everyone.
- Raccoon