Unfortunately, that's how all of this hobby works now. Somebody sees something sell for some ridiculous price (whether it's on a forum or eBay) and then everybody thinks that's the going rate, regardless of condition or "completeness". Between that and whales who do no research and just pay through the nose to get something that second as opposed to being patient and getting the same thing for way less (what it's traditionally valued at), prices just steadily climb up and up with no end in sight.
You would think it's a bubble that would eventually burst but it's been a steady trend for a decade now.
Edit: Good to finally be rid of KC. He's unfortunately one of the few resources in the US for japanese cabs but while his service has always been suspect, it seems like it's really gone downhill in the last few years and, at some point, enough has to be enough.