I think this gets closer to the heart of the issue.
Almost everyone here won't sell something without getting what they feel to be a fair price. However, feeler and best offer threads are a way for an individual to dangle the carrot without suffering the potential callout by the price police, or angst by buyers who have $11.53 and some stickers to deal with.
I have always felt this is something of a yard sale where the seller ought to put a price point on their sellables in order for everyone to get an idea of the sellers concept of the value of the item. The next difficulty lies in that something is only worth what others are willing to pay for it. So, if the seller has a high price on an ugly pair of frogskins that noone wants, the item never gets sold (as per the original sellers intentions). But if they change their mind and want to get rid of it, they can lower their price or entertain previous offers and someone else can wear the ugly sunglasses.
When was the last time a seller like triplestrum posted a sale without putting a price on an item? Even if it changes over time or with negotiation, it is a place for everyone to start from.