We all know why this was added. Those wily gold resellers came up with a fun way to get around the delay-in-mailing-gold problem by having you sell spare ribs for 5k gold. I don't know about you, but when I heard that I laughed my arse off. Talk about a way to game the system.
Changes like this make me think Blizzard hired that guy that forced NyQuil to now have the potency of children's aspirin. Really, whom do they think they are kidding here? If someone is going buy the gold to get their epic flyer it's unlikely they are going to hover their mouse over the checkout button and go: Ya know, I'd really like to just buy the 5k gold and not have to farm motes for the next five days, but, now that I think about it with the hour delay in the AH, I'll just go farm it.