I was a skeptic; "I can't see all the pixels unless I'm as close to the screen as the screen is wide, why bother?"
Then I went over to my friend's place and watched some stuff on his 4K OLED. Holy shit. So I can't see all the pixels, but turns out that only perceiving 2.5-3x the data is still a big improvement.
I'm still not gonna pay for one until they get a lot cheaper.