What Blinky said.
I have a small client base but most of my time is spent as a contract climber. I sub regularly for about ten tree service and grounds maintenance companies. I charge $50/hour. I have considered half-day minimums and day rates after six hours (up to eight, anything above that is additional), but a few of the companies that hire me are small and may not be able to combine enough jobs to make a day's worth. I was also planning to raise my rates this year but everything is so slow; I'll wait to see what happens.
I am expected (and I expect) to climb! If I'm asked to do something unethical, unsafe, or otherwise inappropriate, I simply don't do it. There's always a grey area when working as a subcontractor. Many times I find myself walking the edge of what I think is reasonable or unreasonable, appropriate or inappropriate. And I'm talking about everything here... standards in arboriculture, safety, personal perspective, etc.
My biggest pet peeve about contract climbing is the inconsistency in ground personnel. A few companies that hire me have different groundies every two months or so. You hire me to take down a large tree in a backyard with primaries and house drops and yard art everywhere. I show up to meet two new guys with no idea how to even send me a rope, let alone how to run a porta-wrap. NO THANKS! The companies I enjoy working for have ground crews that rock. Been around for over a year, know how to rig, tie knots, run ropes, set throwlines, and if I so much as sneeze up in the tree they ask me if I need anything! That's what I expect from a crew. This makes my part so much easier!
Now... about that increase in my rates...