You've got your bases covered, it seems. One thing to consider: A big part of the "beware" part of "buyer beware" is research, and that's somewhat limited since the product won't be revealed until after the sale and word-of-mouth would be clandestine at best since a lot of buyers won't be raving (or ranting) openly about the product. I can imagine you tapping into a kind of underground economy of overworked and inspiration-starved writers, though, since social disapproval of getting creative help hasn't stopped the "ghost" market from prospering.

I mean, I hate the term ghostwriter anyway because it shows a fixation on rugged individualism in creativity and creative rights. People think the writer has to be able to do everything from conception to creation, but in truth the rugged individualist is a myth. Any decent book is the product of dozens if not hundreds of individuals' work, as honest writers will acknowledge, and that's before we even get into how all creators are part of culture and legacies without which they won't be able to create in any recognizable way.

It's the need to believe in the writer as sole creative genius that makes "ghosts" not only out of ghostwriters but also proofreaders, commenters and other vital helpers. Can't we just recognize that creativity is a highly distributed and social process and let the ghost be real? [/rant]