Where do you think old equipment ends up? Does it get thrown away? Does it just sit on a shelf in the basement? Even if you give stuff to a fellow reefer what happens when they no longer use it. I'm a skimmer guy and you very rarely see any of the old classics for sale. The massive 12" body SWC skimmers, the WM Cones and my favorite the ATI Bubble masters. It was just a thought I had. I never see them on ebay or rarely if ever for sale on classifieds or facebook groups.