It's my opinion that it would be better if things related to a For Sale item are posted in that For Sale thread as well as who is in line. A little patience makes thing fairer and shows all sides of the transaction. Of course you may be in favor of letting sellers use the forum ( and I'm not singling anyone out here or grouping all together ) to find a buyer and then treat that buyer how they wish.
Everything out in the open or don't use the feature.
As this relates to other things an example would be if a person was showing off a car they bought and a parts car they were going to take the motor out of. A member could see that and ask if they wanted to sell a fender and not worry about having to post a wanted thread. It may not have even been on their mind till they saw the guy's post .
Just one of many examples of this buy/sell stuff around here that makes a person have to be carefull of what they do.