Plastic money lasts anywhere from two to five times longer than paper money, performs better in vending machines, and is harder to counterfeit. And unlike paper currency, plastic money doesn't shed tiny bits of ink and dust that can disable ATMs by confusing their optical readers.
Plastic money also stays cleaner and becomes less grubby than paper money, because the non-porous surface doesn't absorb perspiration, body oils, or liquids. In fact, the plastic money is virtually waterproof, so the bills won't be ruined if they are left in a pocket by mistake and end up in the washing machine. Actually, plastic money can take a lot of abuse. You can bend and twist plastic currency without damaging it.