No because Warlocks are already on the low end of the damage scale, they are desperately needing a boost back up to other strikers. Due to their inability to get a lot of out of turn or minor action attacks, Warlocks are in no threat of being imbalanced.
Fair enough- it's just that I'm playing a Dwarf Starlock now who is going to be taking the aforementioned Sacrifice to Caiphon, and the addition of more miss effects seems like a big boost in the context of this feat.