I tend to look at Guides as a whole in the same book, Fishing and Snowmobiling. I know I generally tip a fishing capt, seems steep but its for a group of maybe 3-5, 100-150 bucks. This is if he got me on the fish and made sure I/we were fishing how we wanted. Did he just sit there or make sure we were having fun, getting all out of the trip.
I tend to look at snowmobile guides the same way, did he/they put me on the conditions I wanted, was capable of. Maybe push me/test me a bit, to make me better. Did they just lead the group through the terrain or did they help us be better riders, give us ideas for lines and pointers, once they got us to a spot to play.
100 maybe steep for a snow guide(for a small group), as he has a bit less overhead than a fishing guide, but look at size of group and how he/they may have helped you.
Also how do you want them to remember you, Is this someone you want to guide you again, Not to say you want them to remember for just your money, but being fair, as next time you may want them to guide you, they will rember you were fair at the end of the day. Therefore even more helpfull.
Just my 2 cents, well 1 cent now with economy.
