I guess they are free to do as they please with their own business, but what's the difference between someone that takes the whole hour to get off and someone that gets off two shots in a hour? Hell, the latter probably gives them a couple minutes to rest while round 2 gets loaded. It seems like a good thing to me minus the loss of revenue from the extra rubber.
Btw, this reply isn't intended to sound hostile towards you if it is taken that way. I'm glad some guys actually get their money's worth from these ladies.