If you look at the top most expensive systems on here or other "extreme" audiophile hang-outs (god help you if it’s WBF), you’ll quickly find that even $5K per component is considered very cheap.
"Performance" is a different matter and a whole ’nother can of worms. But I’d say that "normal high end" these days - loosely defined as some unquantifiable aggregate of: performance, build quality, aesthetic, esoteric factor, desirability, price, and brand cache - is going to start at ~25K per component and 50K for speakers. That’s not even "ultra" high-end, not even close. It gets more expensive each year; kind of nuts at this point. Definitely not sustainable.