I did once after years of not. And I will never ever again.
I spent hours and hours and hours scrubbing off the residue from the stickers that weren't meant to be put on a laptop. Managed to remove them without any damage to the laptop and sold it.
However, thanks to my wife, I have been to both UCR and UCLA and there are a lot of laptop stickers on really old MacBooks still being used today.
No stickers for me.