I think many people have no idea how much it costs to make a quilt - they base their ideas on cost from what they see in the stores - so maybe we should not be that hard on some of them?
I think the itemized listings for costs are a good idea - it's quite an eye-opener - even for those of us that "must make quilts" for the sake of making them.
I also think it is reasonable to charge "replacement costs" for materials if one uses items from one's own supplies.