I've seen a few of those myself, and just shake my head at them.
It makes absolutely no sense to me. Let's see.....my item didn't sell for $100....let me put it back up for $150 and see if anyone wants it!
Seems to me that if someone had been willing to pay $150 for it, they would have bid when it was only $100.....or am I crazy?
OK, sometimes I am crazy, but that's a completely different story!
Steve