What ELSE will land an author on the never-publish-this-person list?
There are only two things that will get you on this list.
1) Dishonesty—which includes plagiarism (as mentioned in the previous post), also lying to me, and unethical behavior with past publishers
2) Being too hard to work with. This includes personality conflict issues, fighting me on every single thing, refusing to market their book, behaving in ways that make it harder to sell their books—basically being obnoxious and/or clueless and refusing to change.
This is what gets you on MY list. Other publishers, editors and agents may have different things on their lists.