I never read the upgrade figures in the wiki properly but did today and would like to share mine which I got in Jan 2017 for our past stay in Feb 2017:
Beach Villa to Deluxe Beach Villa - USD280++ taxes per night
Beach Villa to Retreat Water Villa - USD385++ taxes per night
Beach Villa to Premier Water Villa - USD980++ taxes per night
I think the BV to RWV is far less than what's in the wiki for high season, right?
We booked the DBV offer but where upgraded to DWV instead.
Does this happen regularly?