First I realize that not all quests are liked by every person. However, I'm trying to understand why people don't like the proposed idea with the Adjusted numbers as pointed out by Kookie. And since to me math matters I decided to write out a common situation of 1E 6N 1H (8 runs total). I'm only doing base XP and Leaving out all optional objectives and additional bonuses, elixers and tomes as those will be different by person/group and playstyles.
Using the following Base XP Values: (Keeping #'s simple for demonstration purposes)
Elite: 1,500
Hard: 1,200
Norm: 1,000
Current System will net 9,930 XP after all 8 Runs
Elite:
1500 Base
0300 20% Elite First Time Bravery Bonus
1200 80% Elite First Time Bonus
====
3000
Normal:
1000 Base
0250 Normal First Time Bonus
====
1250
Normal x2: 1000
Normal x3: 0900
Normal x4: 0800
Normal x5: 0700
Normal x6: 0600
Hard:
1200 Base
0480 Hard First Time Bonus
====
1680
=================================================
Under the new proposed XP Ransack the XP for the 8 runs drops to 8,430 XP.
Elite:
1500 Base
0300 20% Elite First Time Bravery Bonus
1200 80% Elite First Time Bonus
0300 20% First Daily Run
====
3300
Normal:
1000 Base
0250 Normal First Time Bonus
====
1250
Normal x2: 0800
Normal x3: 0600
Normal x4: 0400
Normal x5: 0200
Normal x6: 0200
Hard:
1200 Base
0480 Hard First Time Bonus
====
1680
------------------------------------------------------------------------------------------------------------------------------------
This is a Loss of 1,500 XP or roughly 15% XP for those quests where people commonly run 1E 6N 1H.
The only way that could be recovered under this scheme is through more potentant XP elixers or if you break up a Farm like this across 18 to 36 hours.
I agree for the Farming Crowd it appears to be to much of a hit. The only time they would benefit is later when they are farming Epic/ED XP against their favorite Quest(s).
------------------------------------------------------------------------------------------------------------------------------------
So maybe a counter is why not have the -10% per repetition max 90% and put it on a regain of 25% per 18 hours. Full rovery in 72 hours so similar to a Raid Timer.