Wow...$140 is a good haul for stock K501s. I sold a K501 a couple weeks ago with K701 pads for $130 IIRC. It went pretty quick so I'm sure my price was too low. I also sold a Sextett in the same listing for $125. It was in great shape and I had just replaced the elastics. Again, I probably priced that too low. I feel so damn guilty if I make a profit on something, so I usually just try to break even.