They are also less staffed on those 50-75% days, and to adhere to the regulations it's going to take a lager staff than you would normally have at those levels. The question they can answer that we cannot, is would they profit enough off of those days to make it worth the risk of opening.
I know these are artificial numbers, but let's just say it took 2,000 staff members to effectively run the park at 50% capacity. Now with the regulations it takes 3,500 staff members to run the park at 50% capacity in order to sanitize things, ensure people are distance. Keep in mind there would be numerous other things we haven't talked about that need regulated. Like locker use. Do you ban that? Ok so what do people do with bags? How do you replace that income? Do you have 2-3 people per ride stand there and sanitize them? Ok how much does that job pay? Would locker usage be high enough to pay those people?
I dunno the answer to that. That's what companies and scientists and accountants are working on.