I don't see anything wrong with that price on the private seller market. I think a lot of times people over value their stuff on eBay. Just because it cost $10,000+ doesn't mean it's worth $8500 used. I recently sold an equivalent bike (Pinarello F8 with Dura Ace Di2 and ZIPP 404s) for $6800 and I had it listed on a multitude of websites for almost 4 months. It's the longest it's taken me to sell a nice bike and I was asking $7500, knowing I wouldn't get that. I was $5400 into it, so $1400 profit was not unreasonable. Everything purchased legit and through official channels, wholesale channels but nonetheless nothing shady.