Not sure where you're getting those requirements. OP said 60-80 inches, 4k with at least 60hz, and they said "I don’t mind paying a premium". They also never mentioned a VESA mount or "infinite" contrast ratio.
replyThere are lots of monitors that fit OP's description.
There are a dozen TVs at any decent big box store that meet those specs, and roughly zero monitors, even if you look online.
replySeriously: Name one counterexample.
Here's a 75" monitor after 1 single search:
https://www.dell.com/en-gb/shop/monitors/apd/dell-pro-p-75-4...
replyYes, it's only 60Hz, but again, 1 search.
LG 65EP5Q
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