Comment by Aachen

Then you're on the hook and the income dries up when they find out. Selling for cash up front means you got 90% of the law if the prosecution decides you've done something wrong and finds you in the first place (the use of exploits is commonly illegalised, and often indirectly the discovery or development, but not the knowledge or sale)

Not that I'd advise either course of action for the players' sake