the blur stated: "Guides, only on a harvested animal."

If a person does their best to get you on game, regardless of whether game is taken or not, then out of courtesy a tip should be given. Unless you go on a high fence, canned "guaranteed" shoot, I hope you are not going on the hunt just to kill! If you go in a restaurant and have fantastic service from your waiter or waitress, are you going to stiff them if the meal is lousy? No, you should go see the manager so the cook can be talked to!