Now I've got more of an idea what a Hackathon involves (since you dropped in on Crim's show the other day) I can safely say this is one of the best things that's been going on HIVE (albeit very much in the background!) over the last couple of weeks!
Seems to have attracted a few outside users as you've said.
I've had a look at some of the entries, and there are some good ones for sure.
Maybe put a small DAO proposal together to fund more regular competitions, it wouldn't take much of a daily payout to fund a decent monthly prize pool.