But does not mean $1m system sounds like $1m. If anything, most super expensive systems don't sound good because they are set up by people with plenty money but dunno how to set up properly.
Law of diminishing returns. Past a point, the more money you spend does not buy you proportionate benefit in hifi value.
Hifi dealers are also applied psychologists. They know how to spot the buyers' weaknesses/ego/prejudices and key in on that to make a great sale. There is a lot of money on the line. They do not want to lose you to another hifi shop.
They will flatter you if necessary.
Or act like you are truly one of the few who really know how to appreciate hifi.