I bought one at 800EUR and sold it also at 800EUR (~$900). I bought a second one at 850EUR (~$960), but it has really a perfect finish all around the barrel, which is not that common. The first one had a black spot running across several stripes and it made the pen a little dull at that spot.
I then bought an OB nib for mine at 220EUR, but sold the one it came with for 120EUR. So the total price for mine was 950EUR (~$1080). The OB nib is rare and out of production, which obviously adds value to the pen, as many have noted here before, a standard M nib is simply not as appealing for a rare pen like this. Plus I find the M800 oblique nibs fantastic.
Im currently offering this one with the OB nib for only $900, so after paypal fees and shipping Im looking at a significant loss. For what its worth, there hasnt been much interest.
Not sure if the market has changed, but I doubt it. There simply arent any for sale, except one for $2000 on ebay with a stock standard nib, which is an insane price.
The M800 brown tortoise is still my favorite pen. So honestly, if it doesnt sell, Im happy. I have an excuse I tried selling it and couldnt so now I get to keep it. Should keep external pushers for sale (you know, like wives and such) at bay