After seeing a sale listing evolve into an auction, I've done some changes to the rules on selling stuff here.
The auction concept didn't appear to be supported by the Senior Members (in a recent discussion topic), so decided that we shouldn't really have it allowed here anymore. As such, if you are somone who isn't sure of the value of something, or need to get rid of something in a hurry, it's best to list a high-end price, and state if you allow for people to publically submit 'nearest offers', if no one wants it at that price. That way, it doesn't waste people's time if they aren't anywhere near your 'reserve', and you still have the chance of having someone actually willing to buy it at your listed price.

The updated userguide:
12a - Posting of sales is allowed on this forum in the Saleyard and non-TFs sections, provided the sale conditions are clear, all offers are posted publically, and you honour the conditions. If you aren't sure of an item's value, it is best to list a high-end price, and state that you will accept 'near-enough' offers (which need to be posted publically by the potential buyer, and accepted publically by you). It pays to do a little research first on the value range of your items (look on ebay, or ask the board staff), so that you don't feel cheated by undervaluating something, or not getting any bites by overvaluating it. If you prefer an Auction format, it is best to use a dedicated site like Ebay, and you just promote it in the saleyard section. Vague things like EOIs (expressions of interest) are not permitted in the Saleyard - but EOIs (for bulk ordering) are permitted in the Group Orders section, but only by someone prepared to go through with it.
Does this seem like a fair enough system, to allow for a bit of freedom for Buyers and Sellers, without tying up the Board Staff too much with disputes and monitoring of the Saleyard?
Or should their be other changes to the saleyard?