Universities can be expensive, but community colleges typically aren’t. Most of the fuerdai in community colleges are probably studying English to get into a university. Even though they are rich, they won’t turn down a good deal when they can get one (and since luxury cars are so much cheaper in the USA than China, they are considered good deals as well).
One of the services my company in Shanghai provides is review and final edit of applications, sometimes as a second check against what domestic (read non-native speaker) agencies have created. CC is seen as a stepping stone to 4 year degree schools. Usually it is rich kids who had no chance or inclination to pass the Chinese university entrance exam. Also many are told by the said agencies, it is the fast track to US citizenship. Most parents want a foothold in other countries as backup plan to get capital and themselves out of the PRC over time.
