One strategy to maximize the utility of your add-on is to borrow points into the current use year.
For example, if you purchased a 100 point BWV add-on you could borrow 100 points from the next use year. You would then have 200 points to make a reservation at BWV at 11-months out. Of course you can only apply this strategy every two years.
Likewise you could do the same thing by banking 100 points into the next use year and then have 200 points next year.
Or if you plan really well, you could bank 100 points, wait a year and then borrow 100 points and you would have 300 points to use next year. Of course, you could only do this once every three years.
Troy