The Mark Sanchez SP Authentic Logo that was sold recently is back on eBay, and I am not sure why someone decided this was a good idea. Why buy the card for $2600+ if you are just going to turn it around and sell the next day? In fact, the same thing has happened a number of times for a lot of the big pulls like this, and many of them did not sell for low prices.
I guess some people just like the thrill of being hobby day traders with tons of money. You would think that if they have just spent the price of a small car, it would be for something they very much want to keep. Not in this case, though.