In Germany Skonto (discount) for paying within 7 days is common business practice. But credit cards of course don't like it, if you use ask for discount for not using CC.
So far, yes.
Things are beginning to change because Chinese consumers are crowding into Korean stores, both online and offline. Even the President is concerned that the old system hurts the economy by turning away potential buyers. Guess what, one of the perks of being a semi-authoritarian culture is that if the President complains about something, everyone rushes to find an alternative ;)
In any case, I wish there were more competition in the payment processing scene of my country as well. Most people haven't even heard of PayPal here, let alone newer and better alternatives. Perhaps once we get rid of the ActiveX dependence, more startups will be able to enter the market.
As far as purchasing is concerned, PayPal is just another foreign merchant that accepts Visa and MasterCard. A withdrawal is just another international wire transfer. But since both transactions are international, if you combine them you get two currency exchanges and so you lose a lot of money. That, along with the fact that the whole process can easily take 2-3 weeks, is probably why nobody even bothers.
Besides, Korean banks already have a system that allows anyone to send money to anyone else, instantly, often for free. Nobody ever mails checks in Korea. This works perfectly well in our own walled garden. PayPal will probably never be able to compete with that, even when the other side is burdened with ActiveX crapware.