Because no-one is buying D Grade gear and SSD, BSSD anymore. In some situations a good overenchanted D grade weapon and armor are better than higher grade equipment. Using SSB and SSA is expensive. So making D Grade useful again will liven the dying economy in the game. I think that the Grade Penalty should be brought back but have a milder affect than it did so that if you are level 38 and using higher grade gear that there is a progressive slowing down of attack rate and speed. I think a D Grader should be able to wear C Grade gear with a subtle penalty, but seeing a D Grader using B or A sh