What's another $50k when you're spending half a million dollars to educate your kid?
It is absurdly more expensive for int'l students but not $100k/yr.
For example UC Berkeley costs $45k/year for international students [1].
[1] https://internationaloffice.berkeley.edu/students/current/ex...
It's perfectly normal to have loyalties to your own (or original) country, US and China aren't exactly like USA and England, relationship wise. Most US citizens would probably do the same in China.
Add the fact that China has a lot more leverage than a "normal" country when it comes to blackmailing families /friends.
Thus, for wealthy international families sending a student to North America, this is a two-birds-one-stone situation. The child gets a nice way to get around and the parents get a discount on their nice car when they bring it back. The car even doubles as a reasonably stable way to stash cash abroad in a stable asset.