Can't quite see why the seller is going the 'sealed bids' route.
If it was an extremely rare and valuable vintage car or aeroplane then you could understand it , but an RV-8 is not a rarity , but it is nevertheless , a very saleable item.
So surely the seller must know what he wants for his aeroplane and what the market will stand , and the massively knowledgeable RV community [of which I'm not one] will certainly know what one is worth , especially the 'repeat offenders' and I reckon that WaveFlyer's estimate is pretty much on the money !
It is slightly reminiscent of what one sees when thumbing through classic car magazines these days , cars which were complete lemons back in the 60's, 70's & 80's now going for crazy money and of course , they all come with their 'motoring heritage certificate' , not to mention that they all have "matching numbers"... [ WtF DOES that actually mean...
]
BTW , I'm not for a second implying that any of the excellent RV range are lemons , just querying the method of sale that's all.
Also , from my point of view , nothing wrong with tandem seating . If the crack of your rrrse is straight down the fuselages centre-line , then who needs the slip ball..?.
.