Tipping depends on success, attitude of guide and your conscience.
I'd add to this, "how hard the guide worked to get you your animal." If the guide worked his butt off but you didn't connect, it could be that it wasn't the guide's fault. Especially on mountain hunts where some hunters can't get around so well.
People who are paying for fully-guided trips in NA should factor in 10% as part of the cost, and if you can't afford the extra 10% (kind of hard to make that argument), don't go on the trip. On many trips 10% is a lot more than $300-400. Guides don't make much and they depend on tips.
Of course, after you've factored in the 10% the guide still has to earn it but most do or they don't last long.
