Yeah, I like the idea of making meetings have some nominal cost - a lot of organizations won’t even blink at letting anyone schedule meetings which cost thousands of dollars per hour but will need three levels of sign-off for a $50 purchase. It feels like there could be a middle ground where you basically get reminded of the cost to the organization.
I’ve seen some people who will fill the week up with Groundhog’s Day-style repeat meetings, and even the basic expectation that they have an agenda, goals, and need to summarize what was decided afterwards increases the cost to them personally enough to make better use of everyone’s time.