While you may be able to do these promotions once a month keep in mind that the $15 in chips they give you for $10 are only worth about $7.50 cash. That is because if they are played on BJ for instance you stand about a 50/50 chance of winning the hand. Therefore the cash value is 1/2 of the indicated chip value. The same is true for match play coupons but normally you don't have to pay for those.