Indeed... but that's what they say in the presentation... Interestingly, for their other sites they say revenue is coming from other a number of sources - they go out the way to say it's from restaurants and the like..
Perhaps they have all you can eat restaurants when your in? :-)
Goldern lakes . Revenue generated from entrance fee
Hua’an Tulou Cluster . Revenue generated from entrance fee, restaurant and other services
Yunding • Revenue to be generated from entrance fee, hotel, cable car and other recreational projects