I wish to make is that some forum sales boards only permit items with a stated price. I believe TZUK and VRF are such places. More often than not we see listings on Chronotrader where the seller states Best Offer (with no guide price). I cannot see much difference in that well used approach to this one. In fact this seller has committed to the sale however in my other example, the seller has no obligation to accept any offer. So if the seller of this Autavia is honourable I see no reason why this method cannot succeed. Furthermore, the seller can state "offer above" which is the case here and this protects his sale just like a reserve would in a traditional auction. In summary: time frame, regular updates and reserve/minimum are must then the market can determine the final price.
regards
Paul
www.heuerworld.com