There's a great story in the book about Jack negotiating with American Express to become the first credit card accepted in Disney theme parks -- around 1980 or so. People forget that for its first 25 years or so, Disneyland was an all-cash operation. (As was Walt Disney World for its first decade.)
Themed currency still has its fans, though. I know I've heard several people know wish that Universal would do something similar in the Wizarding World of Harry Potter, creating Wizarding Galleons for use in Universal theme parks.
This is a great interview of a real pioneer in the industry. Hoping to buy the book!