I think most everything we do in life involves the concept of "diminishing returns".
I love cigars. And happily I've found that I don't have to break the bank to buy, say, Cuban puros over other less expensive smokes.
Same goes for wine, cars and yes, audio.
Do I begrudge the OP's friend who spent all that cash? Not a bit. Have at it and enjoy, I say. But I have to wonder were I in his well-heeled shoes if I would make the same call. Fun to think about! 😉
Happy listening...