Underhanded at Bartertown Again

[blackspade]

I am not sure I understand your definition, because the situation you describe is resignation:

Resignation: http://www.askoxford.com/concise_oed/or ... on?view=uk
• noun 1 an act of resigning. 2 a document conveying an intention to resign. 3 acceptance of something undesirable but inevitable.

I think you are not understanding my point:
The reality is that until you have a deal you have no assumption that you are going to get the item that you are after.
I don't see the whole situation as either desirable or undesirable per the definition that you posted above.
It is not inevitable that a deal that I am working on will fall through due to a better offer, but it does happen from time to time.
My experience has been that the bulk of the time traders here will stick with the first person that they begin negotiations with.
That is not to say that they start with the first person that responds, it could be the third, but with the person that gives them the best offer.
Having traded here since 1996, I have to say that this site (and admin staff!) and the traders that conduct business here are a top-notch bunch.

[whatsnext]

I hate to know if i showed interest in something i'd have to buy it or trade everytime or face bad feedback.

[EVIL INC]

If I put something up, I go with the first person who makes me an offer I can live with or the first who accepts my terms. If another comes after and makes a better offer, I still go with the person I started dealing with because to me, that is the right thing to do. If I am dealing with someone and they drop me to go with someone else, it is really not that big a deal unless I have already sent my half of the deal. So far, that has not happened to me yet.
If I put something up and I return to find multiple offers in my inbox, I choose the best of the offers because I am getting them at the same time. There have been a few items I have put up where I have had multiple offers but every time, I followed through as my conscience led me.
If someone were to drop me for a better offer, I would understand. I would not agree but I would respect their right to do that and not toss a hissy.