It's related to the AI bubble. The AI companies are trying to make it as difficult as possible to get a good PC, because they know they're cooked if the general public has access to systems that can run AI models locally, so they're buying everything up as fast as they can in the name of data centers that will never be built.
As soon as the first one fails, it's all over. Prices will tumble and memory makers will come crawling back to Valve (and other hardware makers) begging them to buy.