This question has been asked as long as there have been stickers:
I have a very large stash of them hiding somewhere.
I can tell you're not a teenager driving his first carWirelessly posted (iPhone 3GS: Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_4 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8K2 Safari/6533.18.5)
I leave them in the boxes or give them away to people who like stickers. I hate stickers, especially on vehicles (I tolerate whatever sticker the car maker pits on them).
People who put stickers all over their cars baffle me.