Yesterday Very Good Points posted about a promotion United Airlines was offering where the more that people buy United miles, the bigger the bonus will be. Well the bonus is now at 50%.
The Points Guy argues that even at a 60% bonus, this is still not a great deal, however, if you need to top off your United balance for that next award, then this would be a good time to do so and it looks like the 60% bonus may be reached by the end of the promotion so you can try your luck.