I think many foreign women are turned off by what most women perceive as bad habits. Habits like lack of cleanliness, lack of courtesy, constant spitting, loud farting, urinating in public and especially the way Chinese men, in general, treat their women - very badly.

Of course, this is not true of all Chinese men, so there are a very small number of Western women/Chinese men couples around. But very few indeed.

rare, but here's a couple on a pretty well done documentary

http://www.jasonleewong.com/clients/eu/love/#page

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Also, western men can marry a Chinese woman and bring her back home and provide a good life and be the bread winner. But most foreign woman would not want a life in China, so they would have to go through the trouble of bringing them back to a western country, not many woman willing to do that I geuss.

I think most the mixed relationships that I see, a western woman and a Chinese man is the least common. In fact, I have yet to see a Chinese man with any woman who is not Chinese. Maybe they can't get, maybe they don't want. 

I'm from Russia, my husband is Chinese... We are leaving in Shenyang, and I know about 10 families here like us. 

Do ABC's count?  How about Chinese who immigrated to the US at young age?  I know several of these guys with non-Chinese wives.

As far as Chinese men born and raised in China having a foreign wife (other than those bought or bartered for from North Korea, Cambodia, Vietnam, etc)....nope, never seen that.

Chinese men are afraid of foreign women over whom they are likely to lose control.