Yes, can be a bit eye-opening/eye-watering. It varies, but coaches will have a "day-rate" for this sort of thing, which is what applies. They cannot after all, do the regular teaching when attending the competition. You also need to add expenses, like travel, sustenance, overnight stays, etc. It really adds up.
To be fair, my daughters coach always tried to take multiple competitors to competitions to split costs, and would usually get a lift with a parent to remove travel costs, so it varied but wasn't as high as it could have been.
