Why does it cost a buck to have your queens marked?

Imagine trying to mark this queen. With 500 "holes" or mating nucs in the field, there are a lot of bees in the air. Some become absolute pests. The bee with all the paint on her was surely the most persistant. I could move to another nuc on the far side of the group of nucs and she'd show up in a minute or two. Most of these bees are just in the way but occassionally you get one with evil intentions. They usually wind up stinging my fingers and not the queen.