First, your quilt is really nice and anyone should be happy to purchase it.
We have had beautiful quilts that are hand quilted, king size at our quilt guild and displayed during our show (unfortunately they didn't sell) that had a price of $600 on them. I don't think that is out of line, but they haven't sold for 2 years. I guess any quilt is really worth what someone will pay for it. Unfortunately, it has been my experience that most people do not want to pay what something hand made is worth.