I have almot a half bag of elixirs and supplements from few runs of Cof , voh and superior voh.. it's not that bad .
Another thing is farming orange mobs will give u better loot then red yellow and green.Dont ask me why but thats what i noticed and other people too.
The drop rate is always decreased on red mobs to prevent you from getting loot faster. Grind red for the exp bonus and orange/yellow for loot.