i think the fact that they have to be filled is a bit challenging for a new character since the things asked for are so varied and so many. and less room to store them til you CAN fill
The price needed for some of the mats on the AH for these is not worth it. Especially with how little gold we get in Classic.
They can stack even over 9000 now but that kinda useless anyway. Level 40 and got 0 rep so far but got bunch of useless boxes in my bank. Without being able to turn in empty prices for items just gone crazy and every turn in cost 2-10g so bye-bye getting that rep. Blizz can't even think one step ahead.