If I understand what you are talking about, you can refund a pin and then the account it is redeemed on gets negative credit, so they have to buy twice as many pins in order to go members for the next go. You can get a pin off your mates phone, they will probably find out though from their bill! So... I wouldnt recommened it, especially not at school because if you get caught your mates will take the piss if they dont play runescape LOL.