SO your saying that no bonus ever apply to Hard difficulty? O.O
I believe your mistaken.
let me elaborate on my original comment.
Turbine has a multitude of XP boosters in this game
First things, I shouldn't have to point out that things like XP Tomes, XP Potions, Ship Buffs, Voice of the Master and VIP XP Bonus, and Daily run, apply equally to Normal, Hard and Elite difficulty.
There is also a bunch of in-quest boosts that also apply equally to ALL difficulty levels. things like Ransack,Conquest, Traps and secret doors.. Oh and Deaths.... and no re-entry.
That raises the effective base again.
Now lets consider Elite Specific boost. there are a few of them, but there are also Hard equivalents for most of them. Bravery bonus for example. If your are maxed, you get 50%. Hard gives +25%. for a Net 25% difference. You also have first time hard or elite netting an additional 10 or 20% for a net 10% gain. and last but not least, we get the first time ever bonus. 80% on elite! oh.. but there is still a 40% on hard... Net gain. 40%.
so thats a gain of 75% Not quite double.. but wait...Theres more....
when you add up all the universal bonus' we end up with a much different number....
so no. you dont get triple the XP on Elite than you do on Hard. You dont even get double.....
As you can see. Its actually about 11%
This increases the effective Base XP of a quest dramatically.