Hey Kevin . . . sounds like you "PLAN" all the fun out of it.

I am a guide. Have been (and a cook) in this part of the country for several years. Our outfitter talks to the clients. We don't see them 'till they get here and we get "assigned" to them. Clents are told that $100.00 tip is damn near expected. BUT! . . . You know deep inside you have to earn generosity, not expect it. If I'm guiding two hunters at once (very common for antelope especially), each hunter might go $50.00 each.
We as guides (concientious ones anyway) join in with the outfitter/landowner in the field for live scoutings and general checking out the area. A client can pay a lot for a guided hunt, and deserves to get his moneies worth. But they all have a different idea as to what that is. First thing we (I) do is find out about my client. What cal/bullet he's shooting, put a few through paper, what kind of hunting he does back home, what kind of "trophy" he's expecting, what kind of shape he's in, etc. All part of the hunt experience. You become an entertainer as well. We guarantee to put the client on a shooter, the rest is up to him. After the kill, we take care of everything. After the hunter harvests his animal, maybe we go fishing, bird hunting, a lot of guys from back east want a coyote.

IMO, percentages are for the waitress at the coffee shop, not the guide who just spent days huntingwith you in order to make your hunt experience memorable.