It's very interesting - sort of like college athletics. Everyone makes good to insane money - except the people taking the big health risks and/or putting in the hours.
A lot of moral outrage at the idea here though usually from folks getting rich off the industry.
There have been proposals to do something like $10 - $20K for a liver. The way to get around the outrage mob is usually to point out the health risks, impacts on life a quality of life etc.
In short, if you were in a car crash and lost a liver, you'd be getting a big pay day for those things.
Normal split is 1/3 or so to hospital, and 2/3 kept by donor network admins I think for the fees they charge for Organ acquisition. Donor Network West in CA does $90M a year or so I think? I'm not sure what annual fees are nationally, I'd expect in the 100's of millions range (this does not include all the costs to actual do the transplant).
That said, any discussion on this type of topic tends to attract of one liner type attacks from the outrage folks - so not usually worth having.
But folks are thinking about how to dramatically increase donor rates because it is so impactful. Other options have been to pay $100 - 500/year you list as a donor etc which would save incredible numbers of lives at what is relatively low cost. I heard one funny idea which was to do this for folks who get M class licenses (motorcycles). The idea was to both scare them about the risks of riding a motorcycles and of course they really are more likely to be a donor per mile riden (I'm a rider, and the stats are actually terrible in contrast to other things people worry about)