To my understanding, Paypal allows payment for everything. It just will not protect you, as a buyer or seller, if it is not for a tangible good. I ran into an issue once selling my Bears tickets with Paypal. Buyer bought the tickets with Paypal, and we exchanged in person. About a month after the game, the seller went to Paypal and said he never received the tickets. I found out the hard way that it's on the seller to prove the transaction went through. PayPal froze the funds from the tickets, and then made me fight hard to get them back. Some things to consider when using Paypal... in order to prove a transaction...
- be sure to include as many details in the transaction description as possible... if the buyer sends funds via friends/family, it doesn't matter it won't be eligible to be chargedback.
- Paypal will posture like they require a tracking number, however, they do not. You will need to provide email correspondence from the email of the buyer's Paypal account... so the best way to protect yourself is have them send you an email reconfirming everything that has been agreed to from the Paypal email address. If they send it from any other email PayPal will not accept it.
That all said, it's pretty clear in their terms of service that only transactions for goods are protected.... meaning the buyer is really the one who is not protected as the transaction should be ineligible for a claim. I wouldn't count on it though. PayPal typical sides with the buyer so make sure you take all necessary precautions as a seller.