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There is real cost in the uncertainty of whether or not you will actually get the item. I don't want to know 3 days from now if I got the item I want, and any energy I spent between now and then is wasted if I don't get it.
I like auctions for selling because it guarantees I'll sell it on day X (if I make the starting bid low enough), and I don't have to think too much about how much to try and sell it for. When the auction is over I can say I probably could've of sold it for slightly more if I had used a buy it now instead, but I didn't want to put the effort into figuring that out. But when buying, I'm also unwilling to put in the energy of searching and bidding on auctions.