I agree that 50% seems equitable. It keeps everyone happy. As the owner, this is the ONE place where I usually don't step into things. My practice consultant has been doing this over 30 years, and she is all about the money. She has put a lot of time catching this and researching it, and I think of all the people who could be hurt, it would be her. Of course, I can continue to talk to her about it.
Ironically, one of the two is our biller, and she definitely works with numbers all day.