If AECM gave no monetary reward but was basically GECM for yourself + GECM for allies, that would be enough I think. Right now, it's kinda pointless to cover, say, a Long Tom with AECM unless you stay as far away from the LT as possible and move frequently, because the enemy will still see you on radar even if they don't see the LT, and when they notice LT shells, they'll know where it is when they see you. Kinda defeats the purpose of stealth coverage.
It IS good for making a large group appear small, but that's about it, and it's very situational.
[Edit] Oh yeah, forgot about NARC immunity. That's definitely the best part, but it's not really enough.