camp reservations - or wing it? Weigh the choice.

Why would a park turn away a reservation to hold open a site for someone who is "winging it"?

It's a common practice among some hotels. It's considered a "good will" gesture so that they can accommodate everyone or people with last minute emergencies. If the demand starts to exceed supply then the risk is low that the site won't be taken. It's just a possible scenario, not a decree.