The legality of using games of chance to take money from people while there is chance you do not offer a service is still in question.
I too don't like exclusive cards nor gamble games at all, but also have to say that such one is, a time more, not a right argument. Gamble on Istripper is not a money gamble, it's a mere credit gamble - and credits don't have any monetary value.
We don't purchase gamble plays - neither cards - with money here. Only thing we purchase with money on Istripper are credits, which have no real value, are not money and are not convertible back into money. Everything we then do with our credits is, economically speaking, totally fictional.
Moreover, we can dislike gambling games, we can ***** about existance here or frequence of gambling events (and I do), but it has to be pointed, also, that we totally know in advance what gambling is: a game of chance; so we will not be EVER be sure to win, even spending tons of credits. We know it: if one likes, he plays anyway - if he doesn't, then he should simply not play.
I find it's not right instead to gamble, and then ***** after not having won anything and because of that - which was precisely the nature of gambling. We knew it in advance.