No, not at all. As far as ethics go, I really love that I work a job where I don't have to exploit anyone below me for labor, I am not exploited by any corporation, and all my money comes from a consensual working relationship with my client. In almost any other job or any other industry somewhere along the line I'd have to be part of a system where labor is abused, which to me is the far bigger ethical issue. Nobody is being harmed if someone else's name is on my book and I was well compensated for the copyright. For me, my moral compass and any guilt I'd feel is from doing real harm in the world and this is pretty harmless.