My guess, and honest opinion, is that this gunmetal gray '71 is realistically worth around $12K, and that $15K is really, really pushing the envelope of its actual worth. For a good, fair deal to the buyer, I'd say $10.5-11K would've been doable & appropriate.
What transpired during this BAT auction - just blows one's mind. It's as if someone, who knows not at all about vintage Land Cruisers, was inwardly attracted to the 'romantic' appearance of the vehicle, via the seemingly professional made, enticing pictures, and that this someone has a large stockpile of disposable income - and impulsively bought the thing, at the price that he did, based on his own anxiety that the competing bidder would out-bid him (an obvious taboo scenario to him during those final moments) - with his own money being no objective to the equation.
Just sayin.'