Currently merchants are forced to pay outrageous fees for each credit card transaction. This cost is currently spread amongst all consumers. It is only fair that cash paying customers get a discount or credit card paying customers pay a fee. Maybe this way the credit card companies will be forced to lower their rates when people stop using credit cards.
Slashdot simply got it right from the start. Unconstrained and out of control social projects are already being forced to disciplinary actions. Digg and others like Digg will end up with similar format as Slashdot.