I agree, they don´t provide an
in-game advantage
but playing in your private league makes testing your PO team much more easy. I don´t think it is unfair, paying must have some advantage and improving your "game experience" it is a sutil advantage that can be very helpfull. I wast critizising th people that continiusly ask for mor options for supporters and don´t realice they have a very usefull diference with the non-supporters, the private league.