The point breaks and buying points are 2 separate things:
1. Buying points- The idea is to book a hotel worth 15,000 points a night (usually a holiday inn) using the cash + points option= 5,000 points + $60 and then cancel it.
They will refund you 15,000 points (IE: not the $60 but you just got 10,000 points for $60!)
2. PointBreaks- Priority Club releases every now and then hotels for 5,000 points a night (instead of the usual 15,000 - 25,000 a night)
so when you book one of those you basically pay $30 according to the above calculation.