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> It's really frickin' hard for a normal person to acquire additional citizenships

Fewer than 2 in 5 Americans have a valid passport [1]. In some states, that approaches 1 in 5 [2].

So while prevalence of dual citizenship is around 0.3% to 1.5% of population [3], that represnts 0.8% to 4% of passport holders.

> only hangs out with very rich people who can buy some citizenships through investment

You may be underestimating the number of Americans with Canadian, Mexican and Caribbean heritage.