The US Airways Dividend Miles buy miles campaigns just continue. This time you can share miles for max amount of 50,000 miles and US Airways gives you a 50% bonus (up to 25,000 miles). This offer is valid until June 30, 2013. You can access this offer on US Airways website here.
Sharing US Airways Dividend Miles without a bonus doesn’t make any sense. Why would you pay 1 cent per mile for transferring miles from account A to account B?