And that is a point that almost never gets mentioned in these threads.
Many of the Asian woman looking to marry American men are considered "unmarriageable" or have poor prospects within their own cultures for reasons that American culture does not share. Among the Asian women I know who married American guys, this is a common theme; the women marrying cross-culture are often not considered average/normal women for that culture. There are a lot of things that are considered detractors in Asian culture that are considered neutral or even attractive in American culture. Given this, it is easy to see why they might want to meet American men -- they want to sell themselves in the market where they have the most value.
Of course, this works both ways. Culture and marriage is a free market to a great extent. People naturally try to maximize their own value in that market.
good post...