The lack of security is not really a valid reason to change my point of view. This is something you should do to make your product more secure. I can’t buy a game to test it and get banned unless you are willing to buy it for me ? I don’t understand what you expect will happen. Also you should be the one trying to make your program more secure by allowing people to use it on one PC, making it hardware locked, using an authentication system.
Tonight, when Im off work, I will refund this guy and I will release the script to the public saying someone found it detected. I will wait for the public response, and, if they say its not, I will report this guy myself even if i know already he wont care about his worthless account.