I went through my entire collection the other day to take it from the massive containers and into protective pages and a binder. (like half of my collection was already in there, but I had a lot of cards not).
Was fun, I organized them by set, and then the number they were in the set, it took like 3 days of any free time to do, and I haven't finished the last bit of yet.
Turns out I had like 3 Curtis Joseph rookie cards in my set I didn't know of. My favorite goalie of all-time, and I was clueless about it
So I have a large collection of just regular cards, and then I have a good sized collection of premium cards, whether they are signed, rookies, special edition, etc.
Even these days, every now and again I'll go into the Wal-Mart and get a mixed box. Usually contains 4 packs from different years, and then an encased and graded card. Managed to pull a 10 mint McDavid OHL rookie, and a 10 mint Marner NHL rookie in those. Apparently you can get a Matthews NHL rookie card in them, so I'm on the hunt for those haha