US Airways is offering a 50% discount on one transaction for the purchase of Dividend Miles through January 31, 2012. This offer seems to only be available to those that purchased or gifted miles last year. Through this promotion you can purchase a maximum of 50,000 miles for approximately 1.87 cents each.
Usually they offer a 100% bonus on purchased miles, which makes the per mile cost the same. The difference is that this promotion greatly limits the number of miles you can purchase. In the past you could purchase up to 50,000 miles and receive a 100% bonus. The last time they offered this promotion they limited the bonus to 40,000 purchased miles (for a total of 80,000 miles). And this time they’re limiting the bonus to 50,000 purchased miles. So since it’s a 50% discount instead of a 100% bonus, that’s the maximum value you can get out of this promotion.
US Airways’ strategy is pretty clear here. They like making money off of selling miles, but they don’t want you to be able to purchase enough miles to book an international premium cabin ticket. Add that to the fact that they recently raised the cost of purchased miles to 3.5 cents each, and this deal isn’t as good as it used to be.