Interesting topic - I've never really thought about that, but I think I've looked at least one time at almost all of the shots I've taken... it's possible that there are 2-3% of older photos on my hard drives which I never looked at and then forgot about, but I'd be surprised if it would be more than that.
That being said I'm more and more hesitant when I transfer images from my camera to my computer. Because I'm taking a lot of stacked shots, I'm regularly skipping whole sections which I deem inferior and just don't ever copy them onto my hard drive at all. I feel like that's a (tiny) sign of making progress though, as I'm starting to feel more comfortable judging the quality of shots immediately, instead of having to process several and then decide...
That's quite fascinating... it reminds me of my childhood, where I loved to go mushroom hunting with my dad, even though I never liked eating them. It just was a lot of fun being able to find and pick them, being outside in the woods and crossing some rough terrain, I guess. And giving them as a gift to people who loved eating them was great as well.