No it's because they're making money. Lots of it. I'm not saying that it's wrong but don't be so naive. It's always about the money. They don't give a crap who's there or how good they are. Nor do they care which region wins. They want full teams in each bracket to maximize profit and some legitimacy during the tryouts and the games so people come back.
Again, not a bad, it's business. Provide a good product and people will buy it.
