Also, so people can't actually see what you've been selling AFTER the auction's finished! If you had a nice little idea, say polished coins for 110th birthdays, other potential listers, who might want to poach your idea, can't see how successful you are in selling them. If they spotted you'd sold 20 in one week, they might just think 'Blimey, I'll give that a go myself!' A case in point: about 10 year's ago, I started making driftwood crucifixes for a bit of fun. I was genuinely shocked by their popularity and eBay auction success, making between early twenties to thirty quid a throw! I didn't have the market for long! I've done it myself on eBay, seen a good idea, and then trawled the seller's feedback for the stats!