A couple of resorts that I've gone to always have a gratuities envelope in the room for the house keeper.Although I pay a premium for the room I do tip the house keeper.....but it's not 15% of my bill.
I don't agree with the % system.........where's why... lets say you got an outfitter that is charging $6000 for a guided elk hunt and another outfitter is charging $3500 for the same services. Both guides preform the jobs equal.........why should the more expensive outfitters giude get a higher tip just because his boss charges more.
I would tip the wrangler and cook $75 each for the week and the guide $250 for the week.