Nope, it's not - but building a fanbase is mostly based on art skill, art style, and various social factors. Poor reputation as a seller or a pile of buyer complaints don't really have much to do with that (look how many of the "popufur" types have bad reputations or are often complained about).

That was my point - that if a seller flakes out and a buyer has already paid in full, the buyer has no recourse except for public complaint...and public complaints don't seem to mean much.