I haven't gotten that far into it yet but from what I have picked up you spend real money for one of the in-game currencies called diamonds. You can spend them at the item shop or apparently sell them at the auction house for gold. I haven't looked at the item shop yet but apparently you can buy longer lasting mounts and runes that let you do all kinds of things to items, reset your training points, change your secondary class, or that kind of stuff.
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