My Paypal is a personal account and I've been charged fees everytime i have collected money for things sold on here. On a personal account there are different options for the "type" of funds a person is sending you. I don't remember exactly what those "types" are but I do believe one of the choices is gift...and that may be the one that is not charged a fee.
If you send money and claim that it is paying for something, the person on the other end receiving the money, is charged a fee.