It could be something really weird. You could be signing up to give him the details for your minecraft account for all you know
If you weren't going to supply any details, why make the thread? Seems like a frivolous attempt at monitoring social behavior based on positive reinforcement, at least to me anyways.
There's no entering. Any regulars can win. Ill notify winners with a PM over forums and post a new thread. If the winners don't respond or decline the prize I'll just add it to the prize pool of the next competition I'm doing.