I submitted a Fraud complaint yesterday to GB Customer Service, listing the seller's scam listings. GB has promptly removed these scammers, but someone has to take the move to notify them immediately. I see two of his five scams have since ended; I fear two buyers are about to get a rude awakening on scam auctions from NR sellers.
As for the Mark 23, bidding it up to the moon prevented someone from quickly using the Buy Now function and now delays the auction end. There is no way this scammer will be able to sell this gun now. GB is supposed to take their fees from the seller upon auction end, supposedly from the verifed bank account (as indicated by the Verified checkmark); I suspect GB never gets a cent from these scammers as they've figured a way around this too.
I have enough A+ ratings on GB that if this NR seller wants to give me my first-ever F rating for non payment...pfffft, bring it on.