Not sure there is "right" or "wrong" way to look at it but I totally get your view point! I would concur that this lens is a "extreme luxury"

I can see how it would be analogous to the Ferrari Enzo you would love to have as a daily driver and if that's what you like I say go for it

My approach ( again not wrong or right ) would be to see if I could achieve similar performance with gear that represents a little more practical, user friendly and economical approach. Especially if I can get close with the gear I currently own.

I don't place any importance on rarity when it comes to photo gear but I do want the best quality I can afford and that I can actually use with relative ease.

So for me, even if I felt like I could spend that much on a lens, it just doesn't interest me.

Interesting always to understand how others think about things like this....I hope you can bid on the auction and succeed!