I have only gone out with a guide a couple of times but didnt even think about tipping him. I paid him for his services, I guess if he did something exceptionally great I could give him a little more, but to me this is NOTHING like tipping a waitress, a waitress is paid way below minimum wage and depends upon his/her tips to make a living. Tell me if I am wrong but this is just my 2 cents.

When I use to go to the barber I NEVER tipped him either, maybe I am just a cheap skate?