“Games give you a chance to excel, and if you're playing in good company you don't even mind if you lose because you had the enjoyment of the company during the course of the game.” ― Gary Gygax
One of the Kick Starter exclusives was a signed, special decal or sticker.
And addressing the OP, do you have a 'game box' or something that the sticker would look good on? I don't know that it absolutely has to be attached to the game itself, although I can understand the interest there, since the 'exclusive' nature of it might lift the game's value.
Hmm. I don't have one. I picked my game up early at origins. So that is probably why.