Event bosses

[Aar118]

It also depends if the amount of damage you do yields greater rewards than the lower ones due to ranking.  Pretty much no matter what the people who spend money are always going to be in favor when it comes in damage. I believe instead of level tiers, the tiers should be damage.  So let's say the time period is like one day and the tiers are like this:

Tier 1: 100,000 Damage
Tier 2: 500,000 Damage
Tier 3: 2,500,000 Damage
Tier 4: 12,500,000 Damage
Tier 5: 62,500,000 Damage

This is just an example of course.