When you play a game at a casino (e.g., roulette) you know what your chances of winning are. If you want, the casino can give you a card listing the chances of winning in the various games they offer. All of this is regulated by a gaming commission. They come in and look at the roulette tables, the slot machines, et cetera.
When you play fantasy gaming online, you have no idea of what chance you have of winning. Some players seem to have a much greater chance of success, especially those with insider information. You're not just playing against the odds, you're playing against other fans, and a premium is placed on selecting good players not picked by other fans. In this context, knowing what other fans are doing is huge, which is why FanDuel and Draft Kings employees are cleaning up.
I saw one ad for Draft Kings that claimed that over 1.5 billion dollars in winnings will be awarded this season. Does Draft Kings have that kind of money on hand? No way.
The money for the winnings has to come from somewhere. That money will come from the wallets of suckers who place small-time bets and watch their money disappear.
Just enter promotional code: SUCKER. That's SUCKER.