My dad was not into rock music at all. His collection was mostly film soundtracks, classical music and popular music from the 1930s and 1940s.
I like all of those things, but not enough to save the LPs or CDs. I can stream or download any of the ones I really want to listen to and enjoy it just as much, but not have it take up room in my not especially large house.
You have to understand, we're talking thousands of LPs and CDs and hundreds of DVDs. Some of them were worth something, but most of them were worth pennies. The month I paid more to eBay than I did make any profits, I gave up.
This is just one part of the CD collection when it was still in their house. There were multiple other shelves.

I can't find a picture of the LPs, but imagine a wall of them the size of 1.5 garage doors.
And this is just the music. This doesn't begin to go into all the other stuff.
On top of everything else, he eventually got a DVD duplicator and a CD duplicator and just got whatever he wanted from video stores and the library and copied them. We just threw those out.
By the way, stamp collections are barely worth it unless you have a super rare stamp. He had a huge collection of first-day covers he had been collecting for my whole life. It went for $400.