Personaly I do not think that daily quest items should be able to be farmed at all. They should only drop when you are doing the daily and only up until you have the required number. Too many players have become LAZY and do not actually do their dailies like they should. By allowing the daily items to stack and the ability to stick them in the AH Frogster has created a false sence of security amonst players.
Honestly, if daily items were not able to be farmed by others, and bought by me, I would quit the game immediately. Not due to laziness, but due to the fact that most days I have only an hour or two (if that) to play this game, and if my entire play time was devoted to dailies and minigames, just so I can keep up with stats to stay at a (relatively) endgame level, there would be no point in me being at that level, as I would have no time to enjoy all my uber leet gear.