I would guess depending upon miles and aftermarket bits, in the US around $12-13k?
I bought mine for the upper end of this scale about 4 or 5 months ago. 1k miles, full Akra evo system, etc. I think you can get a new one off the floor at dealerships for $14k or so, and the used ones I look at were in the range of $12-13k.
With the new 2017s coming out with upgraded stuff (may or may not be important to others) that might drop values a bit, plus it's winter in most places, so not many people looking for a bike unless you live in CA or FL. The ones looking for a bike are expecting a deal.
as always the bike is worth what you want to sell it for and what someone wants to pay for it. If you want to sell it quickly, have a low price. if you don't mind waiting and have a unique bike, price it for what you would like to get out of it but don't expect it to move overnight.
When I was in the market to buy a used one, there were one or two that I contact that sold within a day or two but they had some nice modifications, were priced low, and had low mileage.
YMMV