I just tried to put a bag up on ebay, completed the listing, took a second look at the gallery photo, and said, No way! I can't sell that! And immediately cancelled the auction. I can't tell you how many times I've done that. In the last week alone.
There've been quite a few times that I've looked at auction photos and thought, "wow, that bag's beautiful, I can't sell that." I don't know what it is about seeing a photo, but it can really make you appreciate a bag.
I do like to keep my bag collection pretty streamlined though, to bags that I love the most and use regularly. Once I do finally decide, I feel ready to "let it go."