There is nothing stopping those people from actually just create an account under themselves. I know that dice sites don't usually allow that, but its very hard to track or find out , if someone who is a high roller, opens an account under himself. And these plans aren't really preferred by any gambler that I have seen yet.
This is not such a bad idea. An idea would be partner with a site owner , and split the cost or maybe do a part of the amount for the bitcoin ads on the forum. Even if its for a week's time, if you get a few high rollers to sign up under you, you will be able to get a good income over time through the referrals. But its still a risk if the people don't register or play under that account.