Like Stephanie said, it costs money for each item you list whether it's a new listing or just by quantity. I also think that renewing sold items helps with relevancy. It makes sense to have multiple quantities for some items that people will generally buy a few of like beads or supplies. Oliver, I don't think that many people buy multiple salt and pepper shaker sets, so it probably would have been better to put the quantity at 1 and renew the listing every time you sell one.