Here are Blue Posts (from the EU forums) about the legendary bad luck protection system, and yes it really does exist.
http://eu.battle.net/forums/en/wow/t...page=2#post-27
http://eu.battle.net/forums/en/wow/t...401625#post-15
Your /played time has no effect on it so just parking in Dalaran AFK wont help. Every time you do something that gives you a chance at a legendary and you don't get one, your chance increases for the next time. Nothing about the exact math used though.
I'm saddened the EU community manager talks freely about it and the US community manager keeps silent on most everything. But thats going off topic.
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