[jfim]

If everybody at work has the exact same laptop model, it allows distinguishing between laptops.

[cloverich]

Also at airports. I liked having no sticker then I was at an airport and at screening they gathered up four identical MacBooks and (non ironically) asked ok whose is this? Nobody knew and they had to start turning them all on.

[kenty]

This. The issue is that once you start and put one on your laptop, it's hard to stop.