I had a friend like you who collected comics from grade school through college and had visions of selling them off for lots of money (for his favorites he even bought a storage copy and a reading copy). I don’t think he even got the cover price when he finally sold them. Unless you have some really rare comics (#1 of a new comic, not just a renumbering of an old one) which became popular later then you might have something. If you just have a stack of 1980’s Spiderman comics then just enjoy them.
I have things like the first 40 issues of the “new” X-Men, and lots of things not popular back then that later were big. I also have things like Dr. Strange with Jim Starlin art, things which I’ve never looked up because I just like the pictures and they were influential on my own writing.
Some of what I have—especially limited edition film music CDs—are indeed worth lots of money. But as you say, it’s more important for me to just enjoy ‘em. I’d spend the money I’d earn from them in short time, but these are just cool little mementos.