My buddy and I have been out with a few guides and we usually tip between $25-40 each depending on the experience. I'm a relative newcomer to this sickness and one of the biggest things I'm looking for is information. The first salmon trip I ever took was with a guide on the Hump. Talk about a madhouse. Another story alltogether.
Anyway, it rained sideways all day and the river puked out from under us. We had two takedowns the whole time and neither was on my rod. But I tipped the guy I think $45 because he worked his ass off on the sticks and gave me more tips and info than I could have picked up in a year of SST or other sources. That's my .02.

Bruce