"Sneaked in the back door of publishing as a writer-for-hire," is how Judy Blundell categorized her career as an author before the publication of her first non-licensed novel. I'm not disputing the merit of the book (after all, it did win the National Book Award for Young People's Literature), but apparently she doesn't look upon the 100 or so books written up to this point favorably, choosing to use a pseudonym instead of her own name to sign the work.
I imagine doing so has hurt me at times, but I've always used my real name on projects. The only time a pseudonym has been on the cover of something I've written is due to the publisher (as in the case of the Deathlands novels I wrote under the house name of "James Axler"). I do agree with Blundell about "losing your writer's voice" by continually toiling in the creative houses of licensed properties, but I hardly see shame in the work done there either. Good work is good work, and should be recognized as such.