Mules (Characters made to store items) are just the territory that you run when you allow people to make multiple characters. I\'m annoyed at games like SWG that only allow 1 character per server, or FFXI that charge extra for each character; sure, it does help the economy when there are no mules, but it also hurts the people who want to have alternate characters. Now, both of these games I mentioned are skill-based (like this one), and have systems that allow you to easily change and adapt your character, so the problem is almost non-existant. Before skill-based systems grew in popularity, I was rather adverse to the concept of single character servers; but I think it makes sense, now that I\'ve had some experience with skill-based, though, I think it works out pretty good.
Anyway, they could restrict your access quite easily, though a variety of means. Correct me if I\'m wrong, but didn\'t the devs say something about only one account per server per user? I\'m not sure if they were just recommending this, or it was something they were going to try and enforce, though...