Say you win, you can transfer upto $200 over the $500 into your REAL account but you have to make a deposit of $50. This is still a 400% bonus so good stuff. So you deposit $50 but have $250 to play with. Best then to put it all on a hand of baccarat if you lose, ah well, if you win you have about $480, play 12,000 $1 spins on black on french roulette and voila you should have about $330 free to cash out.
Its massively EV so check
www.beatingbonuses.com out for full details.