Why not? It's something that you don't see everyday and it didn't cost you a dime. If it interests you then keep it. Btw do you have pics?
Nope, it is a dollar. Didn't cost him one. And I'm sure somewhere out there is a collector willing to pay $2 for it. haha
It can vary greatly. It depends on how many interested buyers there are. In low VF 20-25 condition it might fetch anywhere from $2.00 to $30.00 in my opinion. If it's from an uncommon series or block, it might be worth more.
Last time we tried to get in on a free dollar, it became a huge mess: http://www.cointalk.com/t214229/