You've just posted a few auctions and as you're headed to the mail to empty it out, you see that yellow text: a buyer has been found.  And again.  Next thing you're eagerly anticipating the coming hour when you get to be rich.

This morning I checked the ghost iron dragonlings.  They'd been up in price last night but I'd been undercut since yeterday.  I posted a few more.  A few seconds later it came in, a buyer had been found.  They were too close together to be separate buyers.  I'd put up four.  But there were five sales; one was of the previous day's more expensive ones.  The four or five that someone had posted in the middle were gone too.  That only adds up to ten, but a dozen sound better, so I'll stick with that.

Market manipulation is possible, and I'd hoped that was the case.  If someone had tried to push them up to 400g, I could overprice and still undercut with my supply.  Maybe they'd keep buying them to pull up the price.  I have a lot to sell.  But no; the AH was not cleared, nor did they repost them.  They bought them to keep them.

Thus the mystery, who needs a dozen unique-equipped trinkets?