Well here's my two cents on those that complain about the power pools and their end costs.
The scrapper/tanker epic power Focused Accuracy uses many times more endurance than the blaster power Targeting Drone. I'm not sure if its the same acc buff, but i know it sucks end like no tomorrow, no comparison to the blaster power.
To those of you with inside info, i'm not attacking you, i just know that on my scrapper foc. acc. uses way more end than targeting drone.
So its a power provided to AT's which would not normally be able to take it, and costs more for not any more effectiveness. Seems to be the general rule for the epic powers.