I CAME to China out of a life-long fascination with the place. I wanted to experience it on something deeper than the tourist level. And, I was caught up in the great Dot-Com Bust of 2000/2001. I had just recently lost my father. I kinda felt like I just had nothing going on, and figured a year out wouldn't hurt.
A better question is: Why did I stay so long?
Simple answer: Freedom.
Startling as that might sound to those of you who have never spent an extended time in Totalitarian Communist China.
In China, Old Country is now a vague haze somewhere over the horizon. All the stuff that constrained you there, does not apply in China. Most of us have absolutely zero intention of doing anything terribly subversive, so apart from visas etc. the government has little real impact upon us. And no matter how long we live in China we have no hope of ever being perceived as Chinese, so all that immense web of social and cultural mores and obligations that keep most Chinese so horribly manacled again does not apply to us Barbarians. And if you're at all ambitious, in real terms you may well find yourself more affluent than you've ever known before.
Which leaves us: Free.
There's just nothing like the rush you get from that first hit of near-total freedom. Drugs, alcohol, sex, etc. all simply pale by comparison.
I sometimes heard expats in China proclaim that many of the people still digging away back in Old Country were just "waiting to die."
Today being my 2nd anniversary back in the USA, I can see clearly what they mean by that.