There are two types of skills in the game.
The type you can buy with Isk, and the type you can buy with Aurum.
Aurum is a currency bought through the PSN, where Isk is earned in-game through successful completion of missions. The amount earned is based upon success or not.
I think the game has great nostalgia factor. I enjoyed playing every minute of it. I am glad to see a classic dungeon crawler brought back and I think the developers did a good job with the game. Just a few bumps that they could make changes for to easily jump this game to an 8.5 or 9
Let me correct myself, I didn't mean to say you can buy skills... you can buy equipment through the Aurum, among a few other things.
I did not notice any skills that could be bought with it.
I apologize for that.