Well this at least answered the question whether I should book when I get onboard. Without the gratuities and wifi, it's not worth the $70/day.
My PVP kept saying "just pay out of pocket," but I don't think she realizes how quickly drinking even just sparkling water, coffee and sodas adds up, especially on a warm weather cruise. Then throw in drinks at the pool & wine with dinner. We definitely get our money's worth with the pkg. If it were a port-intensive Europe cruise, it might be different.
I'll keep trying to upgrade but I have to make final payment by Sunday. We may end up just rebooking a smaller balcony cabin with a different fare that incl. the Plus Pkg. The bigger cabin doesn't mean that much to us.