Don't take it the wrong way - but the loot system in Diablo is one of the main reasons that I quit playing that game. It is the pendulum swinging to far to the other end, for me personally. But yes, that was my point, too. Common and Uncommon are all he sells to anyone right now, regardless of level. Like all vendors, he outgrows part of his purpose fairly quickly - which is when he has nothing worth buying, as you level up. Only time I buy anything from him is if I am literally just points away from leveling him up. I'll gladly buy and dismantle ten or twenty Uncommons, if I need to - because it is quicker than going out and finding something for him to decrypt.