The majority are down to corrupt hometown judging or just keeping the house fighter in the win column because it makes good future business sense. A great example of this was Felix Sturm vs. Oscar. Everyone knew De La Hoya vs. Hopkins was next and it was supposed to be that Oscar collected the 4th belt so they could fight for all 4 middleweight belts. If Sturm had been given that decision it would have ruined one of the highest grossing fights in boxing history, and in kind would have cost the city of Las Vegas alot of money. For the life of me I can't quite understand why Sturm bitched about the decision as he must have saw that coming. To be fair, he has more than made up for it with the amount of dodgy decisions he's received in Germany.