eBay permits people to end their auction at any time for any reason. Chris may want to take that option and then auction each pair, one at a time. The way it appears he wants to sell the shoes now, giving the high bidder a choice of any one of 30 pair of shoes, is confusing and will still only allow him to sell one pair at a time. Dutch auctions, where more than one item is available to many buyers, most always contain multiples of the same item. I think Chris, being new to eBay, is unintentionally confusing matters.