Whaaaaaaaa?
For serious pvp-ers, dang straight they invest in these. Alcast makes some killer pvp builds, and he uses a ton of impen armor...sometimes every piece. I see a ton of builds with 30 CPs in resistance.
When I plan to play a lot of pvp on a toon, I usually spend at least 30 CPs here and equip at least two impens, depending on the class and build. A while back impen became way important.
But proc sets won't crit in 13. Yet AOE damage is going up. So there's a chance the meta will shift as we figure out how these changes play. Proc set dps was my stamblades primary reason for using a lot of impen, honestly. If these cant crit, not sure I need as much.