Given that I'm such a nerd, I'm surprisingly Ebay-phobic. I'm actually online clothes shopping phobic too, as I love seeing stuff in the cloth, trying it on at least twice and stroking it an inappropriate amount in the shop before buying... the best buys are ones you slowly fall in love with, think about for ages before buying and then wear to death (well, apart from the uber-bargains like my New Favourite Coat)... no?
What puts me off is not knowing that you're going to get it. When I want something, I want to know I'm getting it. Not to wait 3 days 7 hours only to be sniped- curses! Still, I have heard stories that tempt me... keep us posted on the purchases.