Board Thread:Game Discussion/@comment-4.71.20.114-20130808004208/@comment-13248161-20130808133931

It's also a "drain resources" design. They cut back on Energon Refills so that you no longer get them on any bosses above the first tier, then introduced the campaign event that drained those something awful (for those who were aiming for high ranks anyway). Now they provide incentive to burn through cubes at a faster rate. Their next obvious step is to cut back cube rewards somehow.