Well, it depends on how much data was there as to whether or not it would be useful. The .pz3 could contain all of Vicky except for her eyes and it would still pass your test. That would be useful (Maybe I haven't found the good stuff at ViewPoint yet but I think that DAZ's stuff is way better). And is there any such thing as a truley honest person? Locks keep honest people honest.

Then there is the ethical part of this. Even if the Poser dork's foot is the only geometry contained withing the .pz3 you are selling, you are still selling a file that contains copyrighted material. It's like selling a book that contains a chapter out of a Stephen King novel. No-one is necessarily buying it because of that, but if you didn't get permission, it's still wrong.