Imagine a system where…
1. You pay a 20% fee to withdraw money from an ATM that doesn't belong to your bank.
2. The bank puts thru a charge they shouldn't, you run out of cash, and you get whacked with a $35 fee.
3. The bank charges you a monthly fee after that - another $35 fee.
4. The bank shuts off your card because you're in another city, meanwhile you're lost in the dark, and alone, and out of money, and can't get a cab.
And on and on and on…
Not to mention outright defrauding.