This is where problems arise with MBG. There's no consequence to scam buyers.  Years ago If you lodged too many disputes with PayPal they would block your account.  

Happened to me buying on another business site, deliveries were always late, I'd wait til the last minute to lodge INR dispute with PayPal.  Items all eventually turned up within the 20 days of escalating my claims (and these were over a period of 2 years), 6 items in total over that period, and I closed the disputes. Then PayPal shut down my account saying I had too many claims.  Took me 2 months to get reinstated pleading my case.

ebay needs to have something similar in place.  Surely they are smart enough to notice these scammers