If you check Craigslist, you will occasionally find one that's "barely used, still in original box" or something to that effect. Many people DO buy a wheel and then stick it in the closet. Wheels like that are worth buying, 'cause they're like new for less money. Check out the wheel, pedals and packaging; it's not hard to tell if a wheel's hardly been used.Rule number one for buying a used wheel is, don't buy a used wheel! There are reasons why its used, either faulty and someone's trying to get rid of it or its been banged around too much and on its last races!
Think about this before you buy, just a precaution. You don't want to waste your money on something that you can get new for a bit more money!
Check out the wheel, pedals and packaging; it's not hard to tell if a wheel's hardly been used.