Like most of the posts said, tipping is a matter of what you think your guide deserves. I've been on several guided hunts, and with only one not so good, I gave my guide what I felt he deserved. Regardless of whether you get anything or not, its how hard did the guide work for you. Did he try to get you your game (which may have moved) or did he just sit in a pick-up all day and glass - pretending to be looking? If you aren't seeing game, did he talk to the outfitter and change stratagies? I've tipped from $100 up to $350 for services. I'm not rich by any sense of the imagination - at least not financially. It takes me a few years to save up for a hunt. I've been fortunate to hunt with some real down to earth outfitters. My last hunt for antelope and mulies was with an outfitter who I thing is first class and we hit it off right from the start. I'm going out with him for elk this year and I know I will have a blast. I'm not going to advertise here but if you send me a pm, I will tell you who it is.
In your case, it won't matter but if there is a group of you in a camp, I usually get the guys together the night before and ask them if they would like to pool all their tip money for the camp cook and put it in an enveloperather than each person tipping individually. Lets face it, some guys just don't have the money to tip as well as others. And this way, someone or all of you can take it to him/her with a smile and a thank you. Don't forget, this person was up at least an hour before you to make your breakfast, pack your lunch and probably went to bed after you when his chores were done. By the way, good luck on your hunt.