I know the point of writing "tell-all" books is to make a lot of money and "get back at" folks you think mistreated you. Is that honorable?

I mean who really wins? It changes nothing and just creates more bad feelings. It just seems to me that if you taking money from someone for whom you work it obligates you to remain silent if not loyal. What do you think? Would you seriously write such a book or just imagine doing it and let it go at that?