I guide a lot of elk hunts every fall. 10% is industry standard for a guy that does his job. I've gotten way less, and I've gotten way more on occasion. No guide I've ever met would consider a 10% tip to be less than satisfactory. If you really like your guide, and your thinking about returning and requesting him again, consider a little extra, think if it as a reservation deposit for next time.
Wether you get your animal or not is rarely up to the guide. Generally speaking, the weak link is the client, followed by various other factors that no one has any control over. Now if the outfitter over sold the hunt, then hash that out with him, but don't take it out on your guide.
If you have a guide that you feel like is not putting forth a good effort, have a discussion with the outfitter. No outfitter wants to lose you as a customer, or have guides around that don't pull their weight.
