Maybe they wouldn't spend 50 on a pair of loudspeaker but then maybe it not as important to them as people who would.
Pc gaming has been in decline for years and that's before people were spending 2k on GPUs or 300 for a budget card but so has the landscape of pc gaming.
The days of every other game being released for the pc either being a flight sim or some old school RPG are long gone. Gaming habits of changed that is hardly the fault of a company that releases amongst budget cards halo products.
Just like hifi. Listening habits has changed from the days of class A amps, vinyl/cd collection wall to wall in your house. There will always be the true audio lovers who will still maintain the status quo. But nowadays it about small class D amps, music streaming and compact all in one do it all amps. Would yoi say that was the fault of the high end esoteric companies who released high end, high cost components. Those are the people who would drop 50k on an audio setup but wouldn't spend 1k on a graphics let alone the 2k Nvidia are charging. Are you going to call out those manufacturers for killing musical enjoyment.? Might be a different shoe but it still fits on the same foot.