i have 320% mf set running at act 1 and act 2 inferno, 5hours straight, no legendary

actually your theory may be possible because
each time i bought a new gear, my mentality was sigh, i buy new gear, it's not going to pay off.. and then jackpot, something sellable. which pays off for the gear i bought and more.

i mean i didn't suspect at first, but it just so happen that each time i bought new gear, it pays off nearly immediately.

there is a thread for certain legendary drop area/elite in D3 forum pre 1.0.4, not sure if working now, but i have got some same legendaries from same map too, somewhere tower of the cursed/damned
im pretty sure some mobs only drop certain items, but if someone could create a thread on where u get the legendary, from what mob/elites, if possible, with time and date too will be cool
btw, once i got 2 absolutely same rare bracer from same kinds of mobs, those little scorpion in arreat crater, they come in big groups and the 2 bracers dropped closely, i was standing at the same spot while killing them (not sure if where i standing will affect the drops etc), this is what make me think that there are certain loot table for certain kind of mob, the 2 rare bracers shows exactly same stats after i ID them, not too bad stats and both sold for 1m+, and that time i dont even dare to post them together because i worry that blizzard think i duping and ban me