I see no reason why tournament fights shouldn't give the same points as any other, though I agree with the larger bonus for winning the whole thing.

Otherwise it's all fine with me, though it would be somewhat simpler if a loss resulted in no point loss or gain. (provided no bets were made) 

As for betting items and stuff, I think that's a great idea. It encourages people to have their own continuities, and revenge/nemesis battles would be a lot easier and more common.