People are willing to pay more so they are doing it. Thats supply vs demand. Can't be stopped. Will normalize over time.
I own C9 and G1 and there is not much difference, mostly in HDR (peakbrigthness is higher on G1). I went 12" up and got OLED Evo panel. Wallmounting looks insane on G series, zero gap. Which is mostly why I went with G series this time. Huge gap on C series when wallmounted. Slightly better motion on G1 too, but Sony is the king of motion (interpolation in 24-30 fps content, not gaming - LG wins hands down on gaming; lower latency, more features).
C9 vs CX vs C1, barely any difference here. Only G series got the new OLED Evo panel.
C9 had everything you wanted back in 2019; HDMI 2.1, 120 Hz, VRR 40-120, Gsync, ALLM etc. LG was 1-2 years ahead of everyone else this year.
C series is now considered mid-end, like B series. A is entry level. G and up (OLED Evo panel, with +20% peak brightness) = high end. C series are still great and pretty much destroys all other LCD TVs, but it's not part of LGs high-end line anymore.
You are paying a huge premium for Panasonic and design is pretty bad overall and they are much worse for gaming etc (input lag, features and issues here). Their RMA sucks badly in europe (probably worse in US, a market they vanished from) and software issues are sometimes never fixed. They outsourced their LCD line and will probably soon outsource their OLED line as well. It's not a huge market for them, hence the price. They can't compete, so they price their TV very high. Very few buy them as a result. Good TVs for movies and series, bad overall for gaming especially. You buy a TV based on how the remote is? It's not like Panasonics remote is better than Sony.
I'd get LG G1 or Sony A90J. Best in Class OLEDs overall today. C1 and A80J good too but many OLEDs are good then.