I've given a lot of thought to the posts here, and I'm sure that others will not like my response, but reality is ... why should I be overly concerned what others are doing? If someone is selling below their cost, that's not really my problem. But if someone is selling a twin quilt at $400 because they have so much invested in it, either they need to look at streamlining their process, or check into buying wholesale, or maybe both. The thing is, I don't think people who are truly looking to make money off their quilting would be paying $13/yard for their fabric - they're going to buy at wholesale prices which are considerably less.
I don't sell quilts regularly, but I have sold quilts at "cost" because I wanted to get rid of fabric that maybe I bought then decided I don't really like. I'm more interested in getting more money to buy more fabric to make more quilts than I am interested in making money off the quilts for any other reason.