Getting passed a fake $20 is nowhere near as costly as getting passed a fake $50 or $100.
The assumption is that most people get their money from the bank machine and therefore $20s are what most people have. The number of $50s and $100s that they have to turn down would be minimal.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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