I can and have seen it: if you're the only one in the party dealing appreciable damage to a foe (for any of a variety of reasons), boosting your PP for one last big hit may be all that stands between the party and a TPK.
It seems to me the controller should be the first line of defense, not the last. I'm not even dedicating a lot of my resources to pumping damage in the first place. If my ability to slide, push, prone, or dominate without augmentation doesn't save us from a TPK, how is being able to put out an extra 1d8 damage going to do it?