Well, sales figures is always an issue. The roughness of the grinding tool determines the depth of sracthes and thus the fatigue of the reed. It would be no significant cost to add one or two more polishing discs to make the raw material smooth from which the reeds are stamped out. But this would perhaps increase the lifetime and lead to drop in sales. Everyone sells things which are just about "sellable". If they sell too good they will either increase price, or lower costs which results in lower quality. At least I believe so.