Selling an 1080Ti is probably as annoying as selling a sports car on Craigslist.
You get tons of emails and a few test drives from little kids who can't afford the car in the first place.
Basically everybody wants the GPU because it's a high end card but nobody wants to pay what it's worth.
You just gotta keep trying and eventually it will get sold.
thanks for the reasonable response. i bit the bullet, and decided to list them on ebay. sold 3 already, but they eat such a large fee

better than nothing i suppose. good thing these are ROI cards. been mining ETC, but at this point, im better off just dumping the cards and throwing that cash into ETC.