Sooner or later a buyer will be found for just about anything if the artist is persistent and the price is reasonable, however, the ultimate responsibility is with the artist to produce and offer only the best work possible regardless of whether or not it sells. With the greatest of integrity it is the artist who safeguards the interests of the buyer. Once I had a small piece of wood nearby while I was painting and I was using it to clean my brushes on. It had a rather interesting pattern so I posted it on ebay and it sold. Since the shipping was free and the price so low, it cost more to mail than I received for the painting so I have no qualm of conscience, I basically gave it gratis, however it was an interesting experiment, especially with regard to abstracts.