So a pair of shoes I liked came up for auction, and I emailed the seller with a question. I gave up after a few days and decided I would not buy from a seller who would not answer a simple question. I would have bought the shoes at his BIN price of $69 and paid immediately. The auction ended last night (he never did get back to me) and the shoes only sold for $36. Moral of the story: not responding to potential buyers can cost you a lot of money. I am tempted to send him a message to this effect, but I figure I won't waste my time.