New Ebay Scam? Or Did I Do Good?

I have never had this happen to me and I have bought a lot of stuff on ebay. Anyways, I won this item on ebay for 13.00 and have been getting offers from people to buy it. Yesterday got one offer for $36 and one for $41 plus shipping. I have not received the coin yet, but by looking at the photo's it looks like a 1972P-1DO-007 and according to Chucks web site even at MS65 it is only worth $20. The people who are sending me private messages are active eBayers and doesn't look like stolen accounts. I just do not get it, I did lose one auction last night for the 002 which I wanted and thought it went a little high. I am trying to complete the series, I have the 003,005,007,008 now. So what do you think, is this a new scam where somehow the money they send is no good and I send the coin and lose out, or did I buy something other than a 007? The seller is sometimes off on his varieties, there are a couple 1972's that he had attributed wrong but does have a 7 day return policy so I figured if mine are wrong I would just send them back.