Scamming on ebay is frighteningly easy
"Any auction I operate is on a strict no pay, no receive any goods. So how can you get scammed."
Even if you do that, there's still LOTS of ways of getting scammed. For example:
-Bidder wins auction, sends money to seller by paypal.
-Seller sees money has arrived, sends goods.
-Bidder receives goods but claims goods never arrived, starts chargeback with Paypal.
-Seller has money taken from their Paypal account, so they've lost the money AND the item.
It's up to the seller to prove that the bidder received the goods. Even with recorded deliveries though, there have been cases where the bidder has still managed to get a chargeback from Paypal successfully because they claim someone else signed for the item.
Ebay protects buyers more than it protects sellers, and this is how a lot of scammers operate.