I understand your points, KJ, but perhaps the "wild card" is this: how many folks from Calif. will make it a point to travel to Las Vegas in order to both catch a game and party / gamble?
Stated differently, now many will use game day as an excuse to spend the weekend in Las Vegas, which is something they'd want to do anyway?
Obviously the people who put the deal together have researched the issue as best they can, and are satisfied that there's is a valid business model.