If you really think it doesn't happen, you have not been around long. Think back - nation wide TK had complaints about actions done (I'm not say the s word) when they lost DMCs (changing programs, covering batteries. I even had them clip a wire on board), the big O even sent their jobs out with weak chips and an internal letter saying to change chip if they retained service after warranty, I've had tecs change wiring on plug connectors when they lost the job (little things that don't effect operation but try to make it look like we can't service, even had a mechanic in street attire sneak in and burn a control panel by shorting it and yes he was recognized on camera and cops where called. These thing do happen, I hope you keep your morals and don't become one of those guys.