If this does not disrupt the gameplay, then it will be good to see the original titles in the moolah store. For example, 15% damage for bosses + 10% damage for elite. Let stronger titles be available in the game (20% dmg bosses and 20% damag elite), giving a separate bonus, but perhaps the combinations of these bonuses will be of interest to players.
I think it will be good to see combinations of damage to different creatures + bonus to elites.
Example 15% damage elite + 10% damage doll.