I'll try again.
This is direct from the MasterCard company rules:
"A Merchant must honor
all valid Cards without discrimination when properly presented for payment."
This is what Visa's rules say:
"If the customer indicates that he or she wants to pay with a Visa card, the
merchant must make sure that choice is honored."
"In other words, the choice is ultimately the customer's."
"However, if a customer chooses Visa,
it must be processed as a Visa transaction."
Folk's it's not even debatable what the words mean. "All" means all, and "the merchant must make sure that choice is honored" means what it obviously means.
Any further discussion is just proof that half the population is below average intelligence. But like I said if you have facts, (not just what you want it to be) and you really want to share them, instead of hijacking this thread any more just send a private message.