More than 50% off on Sennheiser HD 650 Headphone

Sennheiser HD 650 has been on sale for more than a decade, that alone is enough reason to embrace its greatness. Right now, Massdrop offers more than 50% off on Sennheiser HD 6xx which is identical to HD 650, except for the color, shortened cable and 3.5mm jack. While the usual price for HD 650 is around $500, Massdrop asking price is $199 which is ridiculously low. If I haven't had the HD 598, I would have already bought this HD 6xx. Anyways, there are only 2 days left for this drop.