Phew! I'm feelin inadequate.
Should not - it's been a long journey. I started out more into HT in the mid 1990s (of course I had my first audio separates around 1980 but then HT became the rage - but of course I was only 5 in 1980

) and when I moved to VA at the end of 1996 I became friendly with a sales person at a local hi-fi shop and for 6 years I did virtually every set-up and install with him. When you're routinely walking into homes, many with $100k+ 2-channel systems, and then go home to your nice sounding HT for music it was an eye opener as to what good 2-channel music really sounds like. So it was an evolutionary process (some of the steps were baby steps and others were with a big gasp that I really spent that much on something) and since I moved about two years ago and only have had the main system up and running a bit over a year in its present state, I'm still tweaking stuff like cabling and room treatments.. I also had access to the store (noted above) after hours (for years) to compare things and also began making interconnects and comparing those as well.
I don't sell things as often as I used to. I have multiple systems and will generally rotate something to a secondary system and when I've rotated things out of a spare system, I'll often just give them to someone. For example, have another integrated AV system where I upgraded a receiver to something with Dolby Atmos and then rotated the receiver in there to a guest bedroom and then what was in the guest bedroom to the office system and had a 13-14 year old Sony ES receiver moved out of the office system and just gave it to a friend. Many moons ago it was my master bedroom receiver and then over the years ended up on a spare computer and then a main computer in the office. Really not worth selling. He was thrilled with it.
Here's one spare system with my Odyssey Candela preamp (which is a true audio bargain):
