He would be getting paid more so how is that not good for Houston??The Houston to Melbourne didn't seem one that was good for either the player or the club. He wasn't really going to change Melbourne's fortunes and the asking price in draft Capital was too much.
The word elite gets used too much now a days. Houston is a really good player and despite what stats show he is not elite. If you asked all clubs which Port players they would like I don't think he would make the top 5.
The positive for Port is there will be Victorian clubs interested who might be able to afford to part with picks. He is not worth a top 10 pick on his own but could be used to move up the draft order.
Otherwise he stays at Port as a good contributor. So they can't really lose.