I'd have to disagree with that. A sale happens when the goods are what the buyer wants, and when the price/quality combination meets his expectations/needs.
The problematic part with this is the expectation of the buyer, which often (for turned items) is based on a comparison to mass produced articles. This then results in a situation where people expect to be able to buy a hand turned bowl for £20, and unfortunately there are lots of hobby turners who give in to that, essentially giving their work away for free.