Actually, they have a far higher savings rate than we do. Most cars in China (i read somewhere) are paid for in cash.The average age of a Buick buyer in China is 32, why is it 65 in North America?
I'm thinking that the "old man" stigma didn't hit China, so therefore there isn't the preconceived notion when deciding on a Buick (or avoiding the brand for that matter). I also think that maybe Chinese buyers have more disposable income and can afford the "luxury" brand's price tag.
Car financing is unusual, although I bet that will change over te next decade.