Why are people under the assumptiom that plenty of rich men marry poor women?

there's always this assumption amongst society that rich men love marrying poor woman and that a womans money doesn't matter

But if you take a look at the reality, vast majority of rich men marry other rich women. College educated financially well off men tend to marry college educated financially well off women. Only in minority cases do rich men marry poor women. Poor men tend to marry poor women

Why are people under the assumptiom that plenty of rich men marry poor women?
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