$50k for something is nothing in the scheme of things. I have a new car that far surpasses $50k and it’s worth every cent. I also have what I want in an audio system that cost a lot.
A decent car these days will cost you a lot more than $50k. A new Boxster is over $100k, GT3, double that. A genesis gv70 or 80 is $75k and more.
As for room treatments, all the people I know that has 6 digit sound systems have a fully treated room which easily costs 5 digits. Nobody should spend 5 digits on an audio system without 1st treating their room