You can win different amounts of coins (usually 10 coins but sometimes as many as 200) or you might even win a skateboard or some Fireworks. Any items you get that are classified as junk can be sold to Quill also in Presto's Edge (for a list of junk items see article Quill the Junk Vendor). There used to be a bug with the game where you could spin the wheel multiple times at once to win lots of prizes but it was fixed.