This is where the OP has justified allowing a third party to use his account by claiming he wanted them to earn the money rather than be given it. The whole thing is a mess and I know some do believe his story whereas others do not believe.

Either way, if we accept his version of events he has allowed a third party to login to his account and plagiarise therefore a sanction is due. If on the other hand he himself plagiarised then a sanction is also due.

As Lucius suggested, maybe a (2 year) signature ban will be sufficient or if the admin want to send a stronger message to the wider community then a permanent ban will remain.