PayPal is excellent for sending money (buying) for the same reason it is terrible for receiving money (selling).

Essentially, the buyer is always right, and so, as a buyer, it is very easy to get your money back in case of a problem. The seller is the one who gets all the fees, and needs to justify himself if there is a dispute. Sellers offer PayPal because even though it is really bad for them, it gets them customers.