Not many people settle for one look, one character, or even one account.
Permanent version of NX costs roughly 2x-3x the price of an expiring one. If you buy NX for every equipment slot, you will be paying for around a years worth of NX up front (say, close to 90k NX).
People who like their look will buy it perma because they plan to stay for more than a year; newer players or casuals may not even be here after a month but the value of permanent is enticing enough to buy. A side effect of buying permanent is that it will always be there and will be there to motivate players to come back to maple should they lose interest. What better way to motivate returning players than with a new class? A new class and the ability to use that Hyper Rock you purchased a while back.
What accessibility does is increase motivation: motivation to continue playing and motivation to try new things.
IMO, link skills are good motivating factors to try new things but fails at motivating players to continue playing. The uber brokenness of a class may motivate players to continue playing but it's somewhat poor at motivating players to try it. Transferable NX does exactly both. It may be more accurate to say that it fills in all the gaps and shortcomings.
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