Between November 15 and November 22, 2012, Priority Club is offering a 50% bonus on purchased points.
The most points you can purchase through this promotion is 50,000 at a cost of $575, and you’d receive 25,000 bonus points, for a total of 75,000 points at ~0.77 cents per point. What’s unique about Priority Club is that even purchased points count towards status, and 60,000 points is enough to get you top tier Platinum status with Priority Club. Admittedly that’s not worth all that much, but given that the value of purchased points is decent to begin with, that only further adds to the value.
Now, there’s a workaround whereby you can purchase Priority Club points for 0.7 cents each, as discussed in this post. The key difference is that points purchased through this method don’t count towards status, while points purchased through the 50% bonus promotion do count towards status.
So if those points would help you get to the next elite threshold it could very well make sense to pay the extra ~0.07 cents per point to be purchasing points that count towards status.