Aren't a lot of those cards sold for the audience that needs more display heads rather than necessarily performance?

This has been somewhat improved-- some mainboards will have HDMI and DisplayPort plumbed to the iGPU, but the classic "trader desk" with 4-6 screens hardly needs a 5090.

They could theoretically sell the same 7xx and 1030 chips indefinitely. I figure it's a static market like those strange 8/16Mb VGA chipsets that you sometimes see on server mainboards, just enough hardware to run diagnostics on a normally headless box.