I used to travel internationally a lot for work, mostly to SE Asia. I saw lots of older (50+) American guys who married younger (< 35) Malaysian/Indonesian women and started a family. Many had no intention of ever returning to the US.
Basically, if you’re clearly American and there for work you’re going to receive 50x the level of interest from women over there than you would back home unless you’re in the mythical top 1% of desirability (AKA rich). They’re very interested in your passport, your earning ability, and if you’re lucky, your interests/looks/personality.
If we step back and just ask “what is marriage” it’s essentially a social contract. You give me ABC benefits (companionship, financial stability, parenting partner, etc.) and I’ll give you XYZ in return. For guys who marry into another culture, the math works out better outside the US. There are definitely others who prey on foreign women’s hope to escape poverty, which is pretty disgusting. But I don’t think that everyone has bad intentions.
I’m 36 and single. Dated multiple girls that could have progressed to marriage but never did, mostly because of 10000% craziness. But honestly, what makes me hesitant to marry an American are the divorce statistics. Some crazy high percentage of divorces are initiated by women and all of the divorce laws favor the women. Unless your wife is a currently incarcerated meth addiction, they’re taking the children. I think we’ve built a system where divorce is practically rewarded. I don’t necessarily blame guys for looking for something better overseas.