This is about levelling up. Why would you put minimum intellect as a requirement for levelling up when it comes to the profession of robber?
Whilst not impossible to do, it's definately nowhere near a walk in the park, if you are merely that - a robber, and it becomes even harder. (oh, yada, yada, the game's supposed to be difficult.. - at this rate, I won't ever reach the level, even if my respect's 10 times the needed one). With all the hunting going on with the new club system, it's hard to keep afloat and robbers are definately at a disadvantage, since you can't do training after level 8. Either you put in a loss or you're keeping level stats-wise. Just food for thought.