I would imagine that with PTC - you can prob Scam a **** load of cash and then do a ptc - this would wipe the records .
The AH method is a good idea and used by many - dont know iof a gm is going to have time or inclination to scan AH records - all these noobs crying to them24 /7 keep em so busy they prob cba to do it never mind necessarily have any cause to under the game rules.