There are only three classes so why the Devil would you need more slots than available classes? It's not like there's all sorts of customization options for your face that can be seen only when you're dropping off/picking up bounties in the tower.
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I for one love having one of each class, but I don't have a huge amount of time available each week. It would be lovely to make a 2nd or even 3rd of one of them to sometimes do the raid 3x on one class just for the chance at finishing the armour set etc.
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