Some day I plan to create a list for my wife as a guide when I'm gone or no longer able to give a damn. I told her I'll list what I paid and give a guide to what each item is worth today as help for selling off what she doesn't want to keep. Until then . . . I have no idea of a total I paid, or what it's worth.
I'm 64 and have had JBLs in my house since I was 4-years-old. Still have that one . . . and now well over a dozen other pairs plus some other brands. To my original Crown amp purchased in 1971 I've added another dozen-or-more Crown amps, pre-amps, crossovers, and tuners. I purchased my original Soundcraftsmen Pre-EQ around 1976 and still have that one and probably a dozen other SC components including pre-EQ, pre, pre-tuner, EQ, and amps. I also still own my Nakamichi Dragon cassette purchased new (my wife was there at the time), and I have five turntables (dumped my first Thorens decades ago), Tandberg cassette, Adcom systems, some Rotel stuff purchased at a yard sale, and more I've likely tucked away that will re-surface next year when we move.
Interesting topic but I'm sure for every one of us who won't answer the question on purpose there are probably three others who can't even hazard a guess. And the rest are too busy listening to the music!