[TeMPOraL]

> Of course, this scales badly.

Like with plenty of such ideas, the answer is to do it anyway - scale it until it breaks, making sure you're always making profit yourself, and then call it a day. Enjoy your money and do something else. A while later people will forget, and someone else will do the same thing.

(The real answer is, of course, to not do this at all, because it's unethical. But that consideration doesn't stop everyone, unfortunately.)