He's an evil guy.

And how is holding her in a contract without the ability to release music gonna make him the rest of his money? If anything they should let her out of the contract so she can work again and give him his money back.

Or she could do what Sony says and just pay Luke while making music without his supervision. She wouldn't be released under any circumstance unless Ke$ha proves to the court that he raped her. And if she's released from the contract, Luke won't get anything anyway, it's already revoked.