I do one Xanth novel a year, because at the moment that is all that publishers will accept; they don't want any other type of fiction from me, so Xanth pays my way.
Piers AnthonyWhen you steal from the library, you are preventing anyone else from reading that book, and the very notion makes me want to drop you in the Void.
Piers AnthonyAs for collaboration - I have done a lot, 26 books, and found publishers increasingly resistive to them. It's not that the books are bad; editors won't even read them.
Piers Anthony