Probably the same reason they vote against their own interest all the time. We're all convinced we'll be super rich soon.
[0] http://memory-alpha.wikia.com/wiki/Bar_Association_(episode)
It comes from a quote attributed to John Steinbeck: Socialism never took root in America because the poor see themselves not as an exploited proletariat, but as temporarily embarrassed millionaires.
> It doesn't matter if most voters don't benefit. They all believe that someday they will. > That's the problem with the American dream. It makes everyone concerned for the day they're gonna be rich
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