Add to that, the human eye only sees up to 500fps in ideal conditions. Why would you pay a bunch of money for extra framea that you physicall can’t see?

Eyes don’t work in fps and the 500fps limit is a myth that is shown to be false in the linked articles. The need for >1000fps is more about how our brains perceive motion and getting as close as possible to eliminating judder.

Also, talking about costs isn’t really relevant when we’re talking about future tech. What is aspirational today will be the norm tomorrow. We’ll get there first with upscalers and mfg and who knows what else is in the pipeline to improve the rendering process.