Auctionsniper and, I would assume, any other such services, do require both ebay user ID AND password, for obvious reasons. Even though they claim that such info. is handled with the 'utmost security', that certainly sounds like a lost-or-stolen-info debacle waiting to happen.....
Imagine watching the screen....as 300 new e-mail messages pour in: ' Congratulations - YOU WON on Ebay! '
Still....one must live somewhat-dangerously in the 'e-age', I suppose....