Is the "% left" number fudged to hide quantities sold?
When a Woot-Off has a slowly selling item, you can watch the "% left" sit at a level for a while and then drop and then sit again. Supposedly, it should be easy to figure out from this exactly how many of the item they have for sale. Not because it matters, but because you're bored waiting for the next item and need something to exercise your brain in the middle of the night to stave off involuntary sleep.
But I saw an item sit at 100% for a depressingly long time, then drop to 89%. That was odd enough, assuming they didn't break one of the units into many pieces and include a few with the first purchase. But then it went to 74% and then to 50%.
So, roughly 12-13% per item. But not exactly.
Are they including a random fudge factor that only becomes obvious on low-quantity items? If so, why would they bother?