I researched this a couple of weeks ago, and the consensus that I found is that most authors do not have the professional skill to make good audiobooks of their own work. Think about all that goes into it: pacing, timing (two different things), being able to differentiate the characters' voices and do so consistently, being absolutely certain you know how to correctly pronounce each and every word you use, avoiding odd clicks, sighs, throat clearings, hoarseness. Even though I have experience as a reader at my church (and from all accounts, I'm good at it), I decided that I'm not good enough to record my own book. An amateurish recording would only hurt it in the long run.
Just my opinion. YMMV