Should sellers not be allowed to advertise then if putting a player up for sale is the end of their contribution? Plus, an advertisement adds exposure to the player which I'm guessing would also increase the price.
No, this action is fine , becuase it is upfront , honest and causes no harm to a buying team, its simple advertisement, there is no link to underhand bidding to falsly gain more money by hicking the bid.
Also, you said that the market has to come up with the value for the player (not exact quote). If sellers can't bid, then they can't contribute to the value of a player. If they can't contribute to the value of the player, then are they still part of the market?
NO, I said this is just an idea, the rest of your sentence, I am unsure of the point of it. The issue is the action of underhand bidding to gain more money in a dishonest fashion, not these symantics and quips that are off the main point.
This is going around in circles, I am happy to leave this debate now, its dragging on abit!!!! You seemto be wanting to focus on areas that have no relevance to the actual issue. No system is perfect, but some are less perfect than others1!