It makes sense. The higher Dagger the higher chance of critical strike (3x damage). The higher Armsmaster the higher added damage to every strike. Both damage bonuses (from the Dagger skill and the Armsmaster skill) stack together. If you are using 2 daggers (no doubt you are) then all this is doubled. Getting the skills to G15 and M15 turns your thief to a disaster for all critters around.Naturally, make sure that your rogue is able to open every chest in the game. The maximal "disarm difficulty level" in the game is 40. Therefore, G10 or M14 or a Disarming boosting item plus a lower skill level. Note that the boosting is simply added to your skill, not multiplied by your rank (expert, master, etc.)
