The person should have sold their HE-500s here in the F/S section. They could have saved 9% in Ebay fees. That particular seller has quite a bit of audio currently listed - amps, Klipsch subwoofers, etc. - so they are some sort of enthusiast. It was probably some guy's wife selling off his toys following a divorce. When that happens, the gear usually goes at a pretty good price.
Given the mens wedding ring also being sold off, you're probably not far wrong.