got one a year ago, also sold hardly.
After I got the request, I set the price at $900,-.
Surprisingly the customer bought it for that price....my share $450,-
Shortly after that I got 2 more requests, but both with any success. The problem is that you can't negotiate with the potential buyer.
I am sure that then you would come to an agreement about the price. So be carefull with setting your price.
deleting the file is a bit work, but doable