When you trade among the stars, there is no repeat business. - Larry Niven

The Perversity of the Universe Tends Toward a Maximum.

Collaborations are unnatural. The writer is a jealous god. He builds his universe without interference. He resents the carping of mentally deficient critics, and the editor’s capricious demands for revisions. Let two writers try to make one universe, and their defenses get in the way.

Geoffrey Eustace Parlette had evidently imitated ancient bad taste in hopes of getting something new and different.