>Without cash, we give way too much power to entities managing the payment systems. Card companies don't like you ? You can't pay or take money anymore. That happened with wikileak, remember ? It was not illegal in my country, but VISA and paypal sure prevented me to make a donation to them. They stopped me to use my money in a legal way because they didn't like it. This is such a slippery slope.

Also, payment processors are not legally required to issue cards to everyone who asks. This adds yet another burden to those who are already poor/un-banked/un-documented.