Back in my high school days I would never have dreamed of having a $10K system, but I knew I liked good sounding music. I purchased my first system in 12th grade (teac and harmon kardon, stuff $300-400)......Somewhere along the way this old guy told me to buy top quality pieces because they held their resale value. So in college got nakamichi and some jbl's and then missions speakers.
Got a job and was able to upgrade thru the years, conrad johnson pv-10 etc, Now at 40yrs+ my system is in the 10-12k range and I don't remember ever putting more then $1500 on a single piece. Most importantly I enjoy the heck out of the way it sounds. I'm from the diminishing return school of thought>
Thru the years the high enders that I know only chased the dream of the ulitimate sound quality more so then the dollars spent.
If u have a favorite tune or cd that you know by heart/ear and you hear it on a really good system and while listeng you hear one sound or instrument that you never heard on your own system, that missing piece is what gets you to chase the next bestest stereo system. This is what propels the high end folks that I know.
The example of the doc that owns a 250K system with a few tunes, well that's his own deal and it's his dough and he can do what he likes with it.
Lastly, I bet that everyone of us has some hobby or interest that we spend way to much money on and if mentioned to "regular people" would cause them to gag......To each his own.