Quoted from oohlou:
There are ~1.4 billion people in China and they have embraced a certain level of capitalism. While their average income is still much lower than the US or Europe, there are plenty of rich people in China who can afford pinball machines.
It's like when Yao Ming came to the NBA and it was mentioned there are hundreds or thousands of seven-foot tall Chinese athletes out there, so if the country gets the basketball bug watch out.
Point is when you have that many people, you also have a ton of every type of person, whether it's the wealthiest, poorest, tallest, shortest, least pinballiest or (potentially) most pinballiest.