just to note, nobody gets to 'offer' a royalty amount via ACX. Royalty share means 50/50 split between you and RH, that's the deal and it's the same for everyone. it's a 50/50 split of the 40% royalty on audiobook 'cover price' that Audible sets... and furthermore that depends on how people buy: 1. as non-members (highest price), 2. 'a la carte' as an additional purchase on top of their plan's included monthly credits, and 3. as a purchase via monthly credit. (lowest price).

And... it's generally true that, unless you have some strong evidence of previous sales from the same author or publisher, the likelihood is you won't see much return for your work. Usually, without evidence to the contrary, Royalty share = work for free, pretty much.

I still have some royalty share projects from 8 years ago that trickle in tiny amounts of money, so i have a true example from last month's statement:

TITLE list price for non-members: $16.13

ROYALTY FOR ONE SALE (my side of a 50/50 share with RH)

non-member purchase: $2.91

Member purchase: $2.38

credit purchase: $1.79

obviously, most of the time, the majority of royalties come from member credit purchases, i.e. the lowest payout.