Don't see how the UFC is going to hurt over Brock. Dana did exactly what he wanted to do...brought a guy in that was ultra popular in WWE and squeezed a load of money out of him.
You have to remember that this is both a sport and a business. Being a good businessman in a sport like this is two fold...on one hand you have the most skilled fighters in the world and on the other hand you have fighters that are not as skilled but popular. Why do you think White has kept Bisping's dumb ass around for as long as he has? It keeps the Brits ordering PPV's...just like keeping Brock around kept all his old fans from WWE ordering them.
I know why you feel the way you feel...I'd like it to be the best fighters and no gimmicks...but when you are talking about leaving millions of dollars on the table certain gimmicks are too lucrative to pass up.