If we compare apples to apples, ie. same room size, same season, of a rack rate vs. points+maintenance, then a 5-7 B/E point is pretty accurate.
I did up a quick spreadsheet over lunch, looking at the BCV Studio, 1BR, and 2BR, across 4 seasons, against the points required for same. They all came out to between 5 and 8 years.
HOWEVER: If prior to enjoying the life of splender on
DVC, you tended to opt for a low cost cash vacation, say a studio during low season, then the number change dramatically.... Compare rack rate of BCV studio in value season, against the points needed to stay that 2BR Dream...and the breakeven point becomes 35 years!!!
You can drive to WDW in a Toyota Corolla you rented from
AVIS or a Mercedes Benz you purchased. It's a lifestyle choice, and a financial one. If you can live your life in style, and can cross a B/E line somewhere along the way...bonus!