If you look at reviews for just about any model of monitor released in the past 5-6 years QC has been atrocious, with dead pixels, backlight bleed, and other odd issues being commonplace, making it a challenge to get a unit that's good all around. This has been especially true for the display that this is most directly replacing (LG Ultrafine 5k).
If you would have taken a second to look at the specs and search for actually comparable products you would find that there are, at least to my knowledge, no displays with the same resolution and higher refresh rates. This makes sense because 5k@60Hz already has incredibly high bandwidth requirements.
The best actually comparable product is an LG UltraFine 5K which comes in at 1,499€ msrp which is 246€ cheaper than Apple's Studio Display at 1,745€ msrp. Oh, and to no ones surprise, it also has a 60 Hz refresh rate.
So to answer your initial question: Yes, people do spend that kind of money on displays with "only" 60Hz.