A bit like high end hi-fi: for some people even though its way past the law of diminishing returns it is worth it to them because it does something special for their ears (or eyes in our case). Or its for cachet
Even though these lenses are beautiful if it was being bought purely for decoration you would be satisfied with any big brass lens at a bunch less money. I think this is the least likely explanation unless some multi-zillionairre has got a penchant for them and regards 12k as pocket change
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