omg...
1) paypal is much cheaper for point of sale than direct acquiring.
2) paypal provides merchants and customers enough security, while security in direct acquiring is depended on provider (not much diff from paypal) or developers - and it should be agreed by payment systems - that also costs money - and each payment system has it s own security reqs (Visa/MC/AMEX).
3) Acceptance of CC via internet is riskful for merchants - because lots of stolen(skimmed) CCs get monetized in it. And people who got fraud want their money back - merchants loose money and products/services. So merchs in internet want to get more protected using adress info to prevent chargebacks.
paypal rules
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