I found this a few moments ago on reddit: http://imgur.com/CqTGaDb
So I propose we do something similar for each agency and let the buyers know about the conditions contributors are in.
I'm affraid this graphic is wrong. Where is marketing and production cost? This is the huges part of it! Packaging and shipping desist lately - you can buy digital version by internet... That changes a lot.
Big companies engage many levels of workers (graphics, game disigners etc...) who work on one game product. Then its marketing and seller part...
In photography there is one author and one reseller (without partner programs

)
Generally I wouldn't compare it to photography.
Back to idea.
I'm sure clients don't know what they're paying for, but I'm not sure they're interested... Client sees price and that's it.
I'm doing photo service and my clients don't care what is my cost. They just ask the price.
But it would be interesting experience to try to show our stock clients the other side, open their eyes (iStock firts on the list!).
Don't forget to mention about places like Photoshelter or Symbiostock!

Can't wait to see your effect in next months

Good luck! I'll help in publicating with all my pleasure.