Originally Posted by 1910NE
Most of the cost is probably liability insurance, followed by labor. People who work on roofs tend to have high insurance premiums i think.
Absolutely, and I didn't mean to suggest it was excessive or anything--equipment, people, insurance, etc all have a price. In fact, when you consider it will probably take at least an hour or two to do it a good job of it I think the "labor" part of the price is reasonable.
My intent was really to say to the OP that if he's on the fence about it, and handy with a ladder, he could do this part of the work himself for not too much money.