Well this is the blue post I was referring to:
http://eu.battle.net/wow/en/forum/to...44870?page=1#6
Says "Whenever you use a bonus roll and you don’t get any loot, your chance of getting loot on the next roll will increase. This increased probability won’t be reset until some loot is awarded, and this is independent of the boss that is being killed.
The bad luck streak protection will carry over and continue to increase the probability from boss to boss and instance to instance and won't reset until you get some loot. Basically, this feature treats all bonus rolls as if they were actually the same, no matter where they originate from."
The way I read that is that the loot protection is not per boss, and only takes into account the number of rolls from any coin until you get something.
Am I reading it wrong?