It's supposed ply and demand. There's more demand now compared to the recession in 2008. And as a few have mentioned , the rich is getting richer and they don't know what to do with their money. So, they go excessive on food, cars, houses, audio systems. I'll bet you that many things of those $250,000 systems do not get much playing time. They get show cases when the rich friends come over for dinner.
And to the poster that is enjoying the $4K system, it's an extreme anomaly to score a $264 RS1.5 speakers....