On Ebay, my 25,000 LPs/7,000 78s/7,000 CDs have a probable sale value of $225,000 (but it would take yeas to sell). Gold jazz/rock DCC CDs are quite valuable as are the obscure violinist LPs ($150 to $500 each) and original stereo Decca LPs (similar range). Then there is the rare ethnic 78s and LPs worth $20 to $75 each. Otherwise, most of my records would garner 25¢ to $2 each (especially my 5,000 Opera/Vocal LPs). Despite mostly mint condition. I have a collection for sale of 2,000+ unused 78s mostly orchestral and 15% vocal, mostly HMV and European Columbias from the 1930s and 1940s for $1,000 (I'm not about to put them on ebay or ship them). I sold the Resphigi MSFL Maazel LP for $225 in 2019. Ridiculous as I found it to sound terrible as do my mastering engineer friends. However, there are about half a dozen listed for more than that and they generally are so sellers at $300+.
I also sold half a dozen Disney LPs for $50 to $90 on ebay in 2018, again rare stereo versions of Funicello, etc. LPs
So there is a reasonable market price on ebay. Most ebay sellers are unrealistic as to the value of their records (too high or condition is inferior in their listing).
So, I am being realistic in stating that my music collection is worth somewhat more than my equipment. Without the music collection, my audio is worthless. With even a cheap audio system, my music collection is my treasure.