I agree entirely Angelo. Who cares if a $1,000 (or $1,000,000) gets knocked around for a few days at $31? It will eventually pass that and the real collectors will step in to determine the current market value. Mel, are you really loosing sleep because of these small timers having a thrill by bidding on a poster that is out of their league?
As Angelo pointed out, the alternative is for the auction houses (or consignors) to tell us what a fair opening bid is. I don't like that one bit and, outside this thread where you are probably just playing devils advocate, I don't think you would either. How many posters have you bought on eBay did you get for less than 2/3rds the "fair market value"? Whether through dedicated research on your part, sloppy descriptions or photos by the seller, or some combination of the two, I imagine a lot... and probably the majority!
If we let someone else set the FMV, this is what we end up with... Heritage is selling an ABSOLUTELY GORGEOUS In a Lonely Place 4 foglio in the upcoming signature auction. Their opening bid is $2,987.50 with BP.
However, as far as I can tell, they are the only auction house to sell one of these in the last decade (and an un-backed one at that). When it sold in 2006 it garnered $2760 with BP. WTF, right? So even though the poster market was a whole lot more healthy back in 2006, they are telling us that the STARTING BID this time around (and in this economy) is now higher than the previous selling price!
Do you really want to leave it to the auction houses or consignors to determine FMV and opening bids?