So far all the quilts I've done have been for family and friends. Once I get those all done, I will likely do some for others, but at the rate I'm going, that may be awhile.
It's really hard for me to tell how much any given quilt has cost because I tend to buy fabric as I see it in whatever quantity strikes my fancy (or my budget) that day. Most likely I'll use that fabric in several different quilts, for swaps, etc. so it's not like I've gone to the store with pattern in hand to buy exactly what I need for a particular quilt.