Looks like the same guy bought both, and rebid on both to prevent sniping.
Smells like a long-term investor / dumb collector. I mean, one, sure, but two? I don't know; maybe somebody spilled acid on their precious and had to buy two right away to make sure they'd never be without one again, but... damn.
And on the $850 one, a hairline crack on the adjustment knob... the thing weighs a pound. Thrown hard it could crack a guy's skull. I don't see how it'd get a hairline crack.