I don't want to get too into it, but you're not going to be able to swipe your own debit card 6,667 times without them closing your account. There are twi definitions of "unlimited," the one that means absolutely no limits, do whatever you want, and the one all banks and companies use. Their definition is: Once we notice you abusing the system you will be shut down.

Read carefully the T&C, but there are usually broad clauses that say they can shut you down for any reason, or no reason.

A lot of ideas you read about on here do not scale up to infinity. Not that the account won't be useful to generate *some* amount of points, but don't count on this being a never-ending well.