That became a big time in comic books because it's when people were starting to break out into independent stuff, the market was getting choked with speculators and everybody was trying to do their own trick covers. ↗
When I was coming up, I kept a ton of comic books, almost 300 comic books. Back in the day, they didn't used to cost that much, so I used to keep 'em, collect 'em, trade 'em. ↗