keegan x33 - 440ish profit

almost an hour wow
probably not doing any more of these long ones
cost is about 27x33=891 fe
after tax the income from the 33 familiar nexus was 462+433+433=1328 fe
437 fe profit (plus the few fe from the rings, but the 437 is what's guaranteed, none of the gear drops are really worth all that much)
pros:
-stable income, there will always be a demand for double corrosion
-simple fight (once you have enough dps)
-you can start doing it even if you only have enough for one run, then sell the nexus, repeat and you can keep going until you hit your FE goal (or get too bored)
-you can find some neat corroded gear sometimes for leveling or (rarely) for selling
cons:
-no "big" drop like with other bosses, all the legendaries are low value, especially at this point
-BORING