By Polar Jan 31, 2013
A new feature has been added to patch 5.2 PTR which nerfs raid finder difficulty after each wipe:

To encourage Raid Finder groups to persevere, each time an Raid Finder group wipes on a boss fight all players in the group receives a stacking buff that increases health, damage dealt, and healing done by 5% (up to a maximum of 10 stacks). This buff is cleared once the boss has been killed.
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