On a serious note FoL takes a MAX of a couple of hours to complete the quest line on each character, and then after that you are 99% done with the event. Even 'causal' players must see that this event does not justify a 2 week span.
There is nothing to do expect spend your real money on Treasure packs, plus Bungie said that the reason silver is in the game is so we can have more and better events. Well clearly we haven't spent enough on silver or Bungie lied to us... I wonder which one is correct
-
$$$$$$$$$$ Same reason there will never be an option to collect postmaster items in orbit or collect rewards from orbit like faction rank ups. More trips to the social area means more times you are around the eververse. Bungie is implementing grocery store tactics to their game.