I think it's an example of 'Auction Fever', Kats. A typical perfect storm of unwarranted hype ("Barn Find", 'Vintage Z', 'Famous-in-Japan owner') and timing (big hoo-ha auction connected to Tokyo Auto Salon, so all the big car guys are 'in town'...) that is hard to replicate. Elsewhere people are marvelling at the price achieved for the 10km-from-new R34 GT-R too, and thinking - probably mistakenly - that it makes their R34 GT-R equally as valuable.
Truth be told, better Zs than the two VZ cars could be bought at much lower prices, but the buyer(s) likely don't really know or even care. It's often the case in car auctions, and I hate them. At least the people at a livestock auction know something about what they are buying...
Yes, I feel a bit sorry for the cars too but I feel even more sorry for the KPGC10s and PS30s that went across the block in the USA over the last couple of years.
Matthew 7:6 "Do not give what is holy to the dogs, nor cast your pearls before swine, lest they trample them under your feet and turn and tear you to pieces".