ask who they get their money from...
I stopped buying from E-bay long ago, after a few unpleasant incidents where buyers withdrew from sales because the price they achieved in an auction turned out to be too low (it was the time before minimum prices...).
I complained, no results. On the other hand, didn't answer to a seller within a few days after the auction because I was traveling, immediately got a warning...
That was when I realized with whom the loyalty of e-Bay really is. Not with You, dear buyer. Their valued customer is the seller, from whom they get their money through fees and commissions.
Who do You think will they piss of first, 100 buyers or one seller?
I bet that even scamers have to pay their fees and commissions to be able to keep scaming, else their accounts would be suspended.
So as long as e-Bay can refuse to take liability for the scams or other illegal actions happening on their portal, how big can their motivation be to stop them in the first place?
Just thinking...