Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums Petroliana Value Questions Sunoco signage. Strictly for debate

http://www.ebay.com/itm/RARE-SUNOCO-Porcelain-Sign-Gas-Oil-Service-Station-/172503959543

So I'm sure some of you have seen this listing and possibly even drooled as I did. This being the first time in my 5 years in the hobby that I have seen one of these porcelain light up Caduceus come up for sale. But even despite it's rarity, there is still a limit to it's value. And I don't see this set being worth anywhere near 20K.
I was seeing this set like this.
Caduceus = Maybe $3500 in the right auction (he says glass is chipped).
Sunoco = $1200 (I actually have this set in same condition and I paid $1200)
Lub and wash = $800 ($400 each. I don't see these bringing all that much money)
Total $5500 (So maybe you even say $6000 total since it's all together)
So the guy tells me I'm not even close. I jokingly wrote back saying "Fools and their money, but I'm burdened with reality" : ) It doesn't surprise me that someone out there would pay more than that. Even though I think these are good numbers.
I'm just curious what Oldgas thinks a reasonable number is on this set?