The tipping "standard" used to be 20% of what the hunt cost.......meaning what the outfitter charged. Most outfitters will acknowledge some sort of percent that they feel is standard.
If you're satisfied with the quality of the hunt, and you had shot opportunities, hopefully filled your tag too........Then the guide deserves your tip. If you filled your tag early and the guide continued to show you around and be entertaining or helpful........they most definately deserve a good tip.
The guides usually can't control the lodging or the accomodations, especially if they are working for an outfitter, and they cant gaurantee you'll hit what they put in front of you. But they should have a good idea of what is considered a trophy or above average for the area and they should be getting you within reasonable shooting distances of good quality animals.
This is coming from a 30 yr guides' perspective, I've never hired or paid a guide myself. Folks who buy guided hunts all the time may have a different opinion.?