I pretty much quilt "full time" and for the most part, I give my quilts away. "No one has enough money to buy them." On rare occasions I have done quilts of varying types for friends, or friends of friends. I do keep track of my hours involved. I keep track of my materials cost and on the invoice for the materials cost, I indicate how many hours were involved and then tell the person to "let their conscience be their guide" and I accept what they offer.
Quilting is a labor of love for me and there isn't any way I can put a price tag on it. I could never do quilting for a living. I'd starve to death!! LOL