I think it's nasty stereotypes that make the men look overseas in the first place.
And I wouldn't overstate this trend. While many of us know some anecdotal example of men seeking overseas females, they are only a statistical few, and the ones I know are men who have a hard time getting a woman here to pay attention to them, or want a woman that is a Golden Retriever with less body hair. I'd be curious to see the long term success they have in getting it and having these marriages work. I peripherally only know one such man, and he's on his fourth.
But that's the problem, looking overseas for a wife imposes its own frictional costs, things like languages and expense. In other words, men have to be forced to look overseas.
And I wouldn't overstate this trend. While many of us know some anecdotal example of men seeking overseas females, they are only a statistical few
The proportion of American-foreign marriages is dwarfed by purely domestic marriages, yes. What is important though, is the trend - overall marriage rates are dropping in the US (in most of the Anglosphere, actually), but the rates of American-foreign marriages are rising (i.e. the rate of purely-domestic marriages is falling even faster, and being propped up by the increasing rate of American-foreign marriages).
I would disagree. I would say that 90% of those who are looking overseas are social misfits who failed miserably in the American market. The vast majority are seeking out of desperation because American women have rejected them in the dating market.