I too thought the percentages were interesting, and I do keep a spreadsheet although I gave up on calculating losses selling gear. I bought everything I have now new.
I dont like sharing how much I paid for anything, but I've listed all components in my profile.
Integrated Amp 15%
TT 15%
CART 12%
Phono stage 9%
Speakers 31%
Streamer/DAC 7%
Cables 6% (This would be much higher if I didn't switch mostly to Zavfino, sold the more expensive Nordost cables)
Isolation 5%