We just got off the Wonder this week, and the "onboard" incentive for add-ons was this:
$99 pp for the "Treehouse Villas" (they don't market it as SSR, guess trying to make it more "exclusive"?)
Depending on the amount of points added, AKL was $100-104 pp with a $500 on board credit for those adding on.
I guess they are really pushing to get all those units sold so they can move onto GFV?
Side note, we were married at GF and have a huge love for it, for all apparent reasons, but there is no way we could "add-on" for $200 pp, no matter how small an amount we bought. Maybe because we paid only $76 pp for Wilderness Lodge, but still, $200+ per point??