If we're talking a few $20 bills then how much do we even trust ourselves? We rug ourselves all the time, we put bills through the washing machine, we let them fall to the Starbucks floor when messing with our pockets, we don't pay attention to them when we get short-changed...
Even if choosing cashu mints at random, I'm pretty sure the amount of cash I'll self-rug in a given year will he higher.