The feeling that you wasted an awesome sticker that you probably should have used elsewhere. Often the result of sticker paralysis, and similar to Tattoo Remorse
Dude 1: "why so glum?"
Dude 2: "Affixation remorse"
Dude 1: "What?"
Dude 2: I stuck that sweet vintage Apple sticker on my old PS2 Guitar Hero Guitar. I never even play that game any more. I should have put it on the rear window of my truck"
Dude 1: "what a waste"