I've never been in a guild where we've finished all the content in the game, but I've definitely seen a difference between raiding farmed content and raiding progression. When you're working on farmed content, things are very, very different from a progression raid-- the mood is lighter, things move more smoothly, more mistakes are made (and it matters less), and there's a little less leading and a little more joking. Not that farming content is more or less fun than raiding progression, but it's a very different feel-- last night I ran Karazhan with my guild for the first time (they're farming it now), and things were very, very different from those raiding days back when we were struggling through Moroes and scared that the Wizard of Oz event might come up in Opera because we didn't have the DPS we needed.
But what if you're recruiting for farmed content? Sara is facing exactly that situation, and she wonders if her guild will be able to find good people now that they're about to finish off all the content in the game. They're expecting loss and attrition (because some people only like to raid progress, and have no interest in farming content beyond their own needs), and trying to bring new people into a guild that's already done everything. Will they only be able to find folks in it for their own loot, or will they bring interested, knowledgeable raiders willing to do the work for the rewards?
Hopefully they'll be able to weed out the "omglootz" people from the casual raiders and the other folks interested in seeing the endgame content. There's no question that running farmed content is not nearly as demanding (and that's why some people don't like it as much) as progressing a raid, but that doesn't mean that anyone wants to take on a raid full of loot whores only bent on scoring their next Epic.