Not true at all. You're only able to purchase one EL when you reach IB rank 3, and one more when you reach rank 5. And the drop rate for nightfalls is abysmally low, to the point that it's virtually non-existent. Saying "oh you can just get EL from nightfalls" is like saying "you don't have hawkmoon? just get it from the nightfall duh." To my knowledge you have the same chance at either. So with IB being the only guaranteed source (assuming i can't do level 34 PoE yet and don't want to do trials), that means I can get two EL per month, because there's no way in hell I'm grinding out to rank 5 on all three characters. That's a broken system.