You don't need stickers for grip (and fact they're not ideal for that anyway). You can do it with a laptop cover (still a sticker, but not of the kind we're talking here), tape, and other things.
Still, sure you can come up with a few more reasons (hence my "pretty much it"). But I don't think you can came with 10 reasons, much less "thousands", never mind millions. And 95%+ would still fall in the categories mentioned.
> You don't need stickers for grip (and fact they're not ideal for that anyway)
You don't need to eat chocolate cake for sustenance (and in fact it's not ideal for that anyway).
It's a minor practical benefit to having a sticker collection on there, which is different to covers, or tape, or other things.
There probably aren't millions of discreet reasons, but there are millions of people with their own reasons, even if they largely overlap, the rationale will be slightly different.
Still, sure you can come up with a few more reasons (hence my "pretty much it"). But I don't think you can came with 10 reasons, much less "thousands", never mind millions. And 95%+ would still fall in the categories mentioned.