You're making their point. Finance gets away with running models, which are simulations. But Sales is expected to actually do it in front of a real Doctor IN THE DOCTOR's office! Which is, you know, where people go to get their healthcare!?
The problem isn't being expected to spend 20-24 days per year with a boss; the problem is doing it in front of 50-100 (over the course of a year) who are deeply annoyed you've chosen their office as a training venue. Hence, the increasing scarcity of office that let reps in.