I have been a video gamer since I was a young child. Years ago buying some NES games from one of the larger video sellers at the time on eBay I noticed that they didn't seem to clean the contacts on their cartridge games they were selling with the worst being a copy of Bad News Bears that actually had black marker on the games contacts that I had to go over a number of times with rubbing alcohol before I could get my system to read the game. This seemed to be the case with most of the sellers I would buy games from on eBay. I mainly sell video games on eBay.