It probably would be better to just have a selection of games that gets added to, but from what I saw from your website, I can see the benefits of rotating games. (Not allowing someone to get unreasonably good at the game) I do have a question for you, though. Is the target audience of these machines arcades? Because if so, how is this not considered gambling? The people who go to arcades aren't gamblers, and I don't think the government wants kids who go to arcades to get gambling addictions.
Would there be a bet limit? Because if someone gets really good at the game, they can just bet a ton of money and make a dent in the arcades bank account. Also, it's worth noting that most arcades use a card system where you put some money on a card and spend it, so having to log into an account. It does seem like an interesting idea, though.