Have you ever purchased so much NX that you needed one of these?

I know NexonJP has weird promotions, but this has got to be one of the weirder ones. LF> translation and reasoning behind this please.

Literally:

年会買永年無料！特典がいっぱい！
メイプルストーリー VISA カードが登場！
貯まったポイントはゲーム内アイテムと交換可能！

Translating in context:
"Free card for prolonged annual purchases! Full of benefits!
(We present to you) Maplestory VISA card!
Accumulated points can be used to exchange for in-game items!"

This is a credit card with which you can use on anything. You can use it to buy Nexon Points, you can use it to buy things in a convenience store, you can use it on online stores, etc. When you spend money using your credit card, you save up points (yes, similar to airline miles). When you have 300, 500, or 600 points, you can exchange those points for in-game cash shop items (Meipon tickets, those stamps that increase the number of lines on potential items, merchant permits, protect scrolls, etc.). The credit cards come in three varieties : MapleStory, Mabinogi and Talesweaver. Each type of credit card has different rewards for each game, depending on which they are.

In addition, when you purchase the MapleStory credit card, you will receive a free Phantom Avatar Random Box, which can give one of the special Phantom cash shop items.

So do I purchase it like any top-up card at a convenience store? Might be good for my non-japanese friends playing JMS, and are at Japan now for an exchange program.