Yes, but the parks rely on them for characters and places for the areas. Avatar didn't make a Billion dollars, it made an IP worth Billions because the parks could use it as a location. There are more people who remember the park about it than the actual movie.

But Park Numbers are insane. They don't have small numbers. I've heard jokes about people applying and listing a job worth millions, when most stuff is Billions. They need Hundreds of thousands of people through each park every week or they won't make enough to maintain and save up enough for the next park.