One of the earlier posters said that Paypal was structurally set up to allow Buyers to defraud Sellers but not vice versa. This has not been my experience. I once used Paypal to pay for a piece of electronics which the seller never shipped. The buyer stalled providing me with shipping information for several days and by the time I figured out what was going on and complained to Paypal the funds were gone from the sellers bank account.
Paypal provided me with a form email offering congratulations that I had won my dispute. It went on to state that unfortunately they were not able to obtain the funds, and it stated that I have no further recourse. It did state that Paypal would continue attempting to recover the funds, but they specifically stated that they will not disclose what actions they are taking. This was 4 years ago and there has been no further communications from Paypal.
In support of Dennis, the EXACT same thing happed to me and through Ebay, the company that is connected to PayPal.
In my case it's only been three years, not four but I'll wager neither Dennis or myself will ever see our money again.