I occasionally look at Ebay, though my first burst of enthusiasm has certainly passed. The other day I saw this, a cardigan knit of Rowan Denim. Not something I would have knit myself, but from a quick search at Ravelry I found that it is called Favour and probably has more than 20 balls of yarn in it!
The auction had a thrilling finale. Only one other person wanted it, and they put in a bid with about 3 minutes to go. I raised my bid, but balked at going really high, so they still got it for less than the yarn would cost new.
But think of the fun I would have had unravelling it, letting the yarn stew for ever in my closet, wondering what I had got so worked up about. 'Tis better this way, perhaps!