I don't really have a dog in this race, but it may be worth pointing out that abridged editions can actually require more
work and money to produce, since you have to hire somebody to abridge the manuscript.
I've known more than one starving writer or editor who has made a little extra money by cutting another author's manuscript down to the desired length for the audio version.
I've never done it myself, but I gather it's trickier than it sounds . . . .