There was a link to this article about Asian trophy wives in the comments.
Here’s my take: it’s not as easy to find a trophy wife as it used to be. While, by definition, these rich old men are alpha-males, they are alpha not because of their personality and physical appearance, but rather because of their wealth and/or fame.
Young Western women, today, are more likely to be grossed out by the idea of having sex with a withered old man. Marrying a man for his money has become less socially acceptable than it used to be. This is especially true among smarter, college-educated, upper middle class women. A rich man who wants a young white trophy wife may have to settle for a slutty prole white woman.
So I think that this phenomenon (if it really is a phenomenon and not something the author made up in order to write an article about something) is a result of Asian women not being as grossed out by old men because Asian culture is a generation or so behind Western culture. The author of the article mentions how the Asian trophy wives are well educated with good careers—that’s the type of white woman who is least likely to be interested in being some old man's trophy wife.
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Lee writes in a comment:
In addition to white men conquering our lands in East Asia by stealing our gunpowder invention, now they're stealing our women. This is why a lot of Asian men are bitter, because or your imperialistic past and taking things from our lands, and now you're taking over women? Another reason why we're bitter is because while you white guys with yellow fever can get Asian girls, we can't get white girls in return because of all the stereotypes you white guys created to "disenfranchise" us of all women.
Also, if these white men are to date outside their race, why pick a race where the guys get screwed over the most and have little to choose from? In other words, if you white guys dated Latinas, the Latino guys wouldn't get screwed over since they'll still enjoy access to white women to make up for the Latina women going over to white guys. On the other hand, Asian guys can't do that, while white guys get Asian girls, Asian guys can't make up for that shortage since white women don't want them. So why do you white guys pick a race where the male side get screwed over the most? Keep your damn fetishes to yourself and stop screwing us Asian men over with the negative externality you have created upon us.
Lee has some valid complaints.
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Roissy, who is an expert on women, writes in his blog:
It’s now my belief that most white women harbor a deep distrust, even jealousy, for Asian women. They see the Asian girl, like they see foreign women fresh off the boat, as competitors for the white men they have come to expect will bow and scrape before their precious white American vaginas. This jealousy contrasts sharply with the indifference they feel towards black and latino women taking their white men.