This is faulty logic, since the option to make the game easy by telling players what mobs agro is a statement about what kind of game it is and the kind of player it wants. It's not just a matter of personal preference. You can't have both kinds of players just voluntarily making the game how they want it.
If players who have kept their agro icon off for 30 days enjoy increased drop rates, that's another thing. Then you can play your game and they can play theirs fairly.