Every so often I glance at the Market to see if anything worthwhile crops up. A few times I've noticed that there are listings outside of the usual robes, hide, backpack business. Usually it shows up as a single listing under a random category, but when I click to investigate, the market tells me there aren't any listings under that category. My first thought was that someone bought the listing seconds before I clicked on the link. It's happened more than once and it seems odd to me that every listing is snapped up seconds after I notice it.
Minor issue since the market is more or less useless, but I'm curious.