My mood is fine though reasoning with my seven year old seems easier than with you!
You started off by stating that "...the 4090 is not good value", which is like saying "the sun is hot". I repeat what others have said, the top tier card has never been "good value", nor is it intended to be so. Where have you been for the last ten years? (Maybe you're only ~15yr old which would explain things and for which I apologise.
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The top tier card (normally called "Titan") was usually the preserve of the graphics/video professional because it generally had twice the video memory of the consumer gaming variant and also cost near enough 50% as much as the x80ti class card, though the gaming performance itself was barely better, if at all.
So if you go back ten years if memory serves me correctly I believe the GTX Titan cost ~$1000 while the same generation 780Ti cost ~$700 but gaming performance wise both were pretty much the same but the Titan had twice as much memory. And so a similar pattern continued up until the RTX 3090 where Nvidia departed from the naming scheme and dropped the "Titan" name but everybody knew this was the Titan class card with barely an improvement in gaming performance over the 3080Ti but with twice as much video memory for which users paid a premium even though it was only really graphic professionals that reaped the benefit.
Forward to today where we have the 4090, which is in effect the Titan class card but Nvidia has decided to scrap precedence and created much more of a performance gap between the x80 and the "Titan" 4090. You seem to forget that the 4080 launched at £1200, so yes that was a "stupidly high price" based on the last gen pricing, which made the 4090 seem like decent value for a change and also why the 4080 sold relatively poorly which is why they have dropped the price, though many 4080's are still priced around £1200
You also seem to have been hoodwinked by Nvidia by trying to justify the price of the 4080 by comparing it to the 4090, which is what Nvidia want you to do. Whereas what you should be doing is comparing the price of 4080 (and cost per frame) to the price of the 3080.