Paypal terms forbid using it for any virtual goods, it is to be used only for trading physical goods, shipped by post to a physical address, how difficult is that to comprehend?
There is one Paypal user who got an exception: VirWox
Everyone else who uses Paypal for anything else then a physically shipped product deserves to have problems - Paypal is not ever to be used for anything that is not a physically shipped product by mail - remember that forever, period. Even sellers who sell mobile phone SIM-lock unlock codes - which cost JUST SEVERAL DOLLARS EACH - and are a number that could be send by E-mail - send them by physical paper letter - although it increases cost and time of transaction - but there is no other way - even if its 5 dollars, break the rule and you'll lose money.