Four tour buses... so say 150 people who on average spend $10,000 each and I'd guess in their 10 day stay were served by thousands of staff in front and behind the scenes.
Chinese like to travel but understand the Chinese tourism market hasn't even started all you see now is the early pioneers.
Right now China has 200 new airports under construction, air travel there is set to BOOM and from that will flow tourists to every corner of the globe spending trillions of dollars.
https://simpleflying.com/china-to-bu...-new-airports/
"The new Beijing Daxing International Airport costing $13 billion dollars will have the ability to handle 72 million passengers each year with 268 gates, with the capability to be extended to a size that would see it hit an annual passenger number of 100 million"
America only has a very small population, China could probably send you another 50 million tourists a year.. if your nice to them.