You can almost certainly guarantee that the Org will have donation boxes all over the exhibits with reminders that this is all .."possible because of your donations..." yadda yadda.
Keep in mind that Bethel has a good amount of steady visitors, and they want to have something to show.
Sadly even my family is profiting from this. They opened a hotel close to Bethel that relies on about 80% of Bethel visitors to stay in business.