I've entered so many competitions that I'm convinced they are fixed. Not because I'm bitter, but the winning entry in these competitions are never the best ones. It's always some person in some obscure location with a mix that barely used the provided samples creatively.
All of these competitions are like that. The last one I entered was the Sonar Music competition and that was a complete farce.
Donít worry about people stealing an idea. If itís original, you will have to ram it down their throats.