There is, but if you consistently win, they’ll stop taking your bets. And there’s limited options for who will take your bet.

Granted, cash poker is all about sitting at the right table. It’s really the poker tournament structure that legitimizes it.

There are definitely professional sports bettors who have an edge and win over time. I'm not sure it's always that hard as most bettors bet on the team they like without calculating the odds.