Would anybody know if the lounge has a paid option?

I've redeemed points (with a bit of cash) for three adults in a room (wife and I plus young adult son) and have redeemed a club room.

There is a cheaper option available for a standard room, which might work out cheaper as I'm Titanium, so my wife can accompany me with no issue. Wondering if paying for son to use club daily would be a better deal than redeeming outright for the club room. Not to mention I could apply a free-night to the standard redemption.

Any thoughts would be greatly appreciated.