So weird. He didn't even get any money and returned her. Plan failed. You'd think he'd be like PHEW and move on to his next crime instead of trying to drum up attention.
I am not sure that money were his actual motive. He allegedly raped her several times.
Maybe that was his motive all along. Apparently he believed that another girl lived in that apartment (but she moved out). Maybe he was out to rape that girl, but kidnapped DH instead to assault her.