Love these scam emails I actually work for a internet company and deal with these scams on a daily basis. I think hillsy was just about spot on for the scam.
These unscrupulous people get your info then send fake emails looking like they are coming from paypal, here is the thing though. All the ones I have dealt with they have never attempted to pick up the vehicle. What I have seen is that they will say they are sending a little extra cash through PayPal to have you send a money gram or western union to the "shipper" because they are over seas and only have access to paypal but the shipper will not accept paypal to pick up the bike.
When you send the money they have you fax the receipt and then the scammer or "shipper" can go any where in the world to any office and pick up the money, usually in eastern Europe. They don't want the bike, they only want the money because money is so easy "laundered" and lost along the trail, where as a motorcycle is easier to track per-say because it would be delivered to a physical address.
Sneaky little buggars and people fall for it every day. Boggles my mind.