Celebrities and hedge funds will often do things like "rent out Disneyland for the day" as well.
The VIP package for Disney and Universal is worth every single penny. You get a personal guide taking you to the back door and walking you straight onto every ride. Then your lunch is already made and ready for you during the day to save even more time.
You don't even need to be a celebrity or a hedge fund to do that.
The public state college I attended rented out Six Flags every fall semester for a day, with free (or nearly free/subsidized) tickets for students.
It was a great way to attend, because it was basically students-only, so no need to worry wasting insane amounts of time in lines. And overall, the vibes were great.