If it ever had a sticker, I'll get rid of it for $0.
Stickers leads to glue on a palmrest
glue on a palmrest leads to black 'hand sludge' on my laptop
black 'hand sludge' on my laptop leads to anger
anger leads to suffering...
I pay for quality, not bragging rights. I personally don't care what anyone thinks of my computer, it's mine and it has specific jobs to do, none of which depend on someone saying "OMG you have a Mac U R SOOO cool!"
I'm proud of the product, although I had no part in designing it... I only worked in the retail store for a few months. Presuming it didn't cost $300, wouldn't you want to show your "loyalty" or "approval"? The idea is that you become part of the lifestyle. Do I want people to know Macs are the best? Damn straight. Do I identify with the brand? Yes. Am I a corporate tool? No.
If you're a genuine advocate and supporter of a company's products, it doesn't mean you're a "billboard."