I’d add also that the profit is on the “wagering” rather than the “deposit”. If you deposit $100 and wager it x10 (ie $1000 of bets), the profit of 2% is on every $100 of that $1000.
Also – don’t forget the law of the gambler states that “he/she will continue to bet until there is no money left” 
Cheers
Simmo!