Not sure what you mean exactly. If you mean the virtual rates, a gambler has no way to make money by placing bets there (while the real probability is 1/8, the odds the betting company is selling are of course much worse). If you mean in a broader context that it is easy to take these people's money, yes and no - there is a long queue of people wanting to do the same and what they want to do is mostly either heavily regulated or illegal.