It his own responsibility to manage his ammo. When he chose to spend it in EU, by shooting in some direction he must understand that he is not guaranteed any remuneration for that. If he is skilled enough, geared enough, experienced enough to survive until the point where he click for loot, then he may get something. This is how EU works.
Now, I do plan indeed to let him do 20%, but this is a plan only, nobody guarantees this is how it works. Again I use my skill, gear and experience the best again and I get to the point where, if I did more than 50% damage I am allowed to click and get something.
When a GD enters the radar or when a miner drops a bomb I am lagged, I lose ammo cause I do less DPS. This is un-natural behavior and it is determined by software. Blame this if you want to blame ammo loss, but blaming me cause you didn't manage to loot X mob, cause you are not fitted to do that activity I cant accept.