Three things strike me here: audience, proximity, and predicting behavior.
- The audience coming out of the waterpark at the end of the day are different than the people entering the overall park at the beginning of the day. If nothing else, the larger group will include people who have no interest in going to the waterpark and therefore find no value in it at all. The smaller audience is more highly qualified.
- The proximity comes down to when you received/perceived value. Polling people immediately after they had a fun filled day is terrible timing. Think of the last time you went to a movie you LOVED. On the way out, if someone had asked "want to see it again" you would have said "yes!" but a week later, much less so. Now a year later would you buy the same movie on streaming?
- And finally, people are terrible about predicting their own behavior, especially if it requires work or not-immediately visible value. That's why most New Year's resolutions are dead by February. After hitting this lots of times, I stay away from "would" questions: https://caseysoftware.com/blog/the-problem-with-would
But without going through that pain and suffering it first hand, it's hard to predict when/if it will occur. There are lots of other packaging & pricing strategies to address this intersection of economics & psychology.