I do. I'm not sure why. Games that I purchase a physical copy of, I remember that I own them. And even though I have a huge backlog, I'm still aware of the physical games that I'm not playing. But my digital purchases, I tend to forget about most of them. I don't know why that is. But every time I scroll through my Steam or GoG library I'm constantly seeing games and thinking, "Oh, yeah! THAT game!"
I think some of it may be because most of the games I purchase from Steam of GoG are on sale. These days I rarely buy something that isn't on sale. If I want a game and it's not currently on sale, I put it on my wish list and wait for it to go on sale. So when a sale comes around, I usually purchase more than 1 game at a time. So my point is, when I purchase these digital games they're in bulk for cheap (more or less) so maybe I don't put any "value" on them in my mind. And then also, those games might have been on my wish list for a while. I might have been pumped for the game when I added it to the wish list, but by the time it was on sale and I purchased it I was no longer pumped to play it.