I understand the basics of the world-of-warcraft auction house and it would seem logical to draw some parallels between that AH and this AH. There are two differences between them however that makes it seem like the AH is something to be picked up later in the game, hence my question.
The AH in WoW was generally used from level 1 for me as I could supply gathered crafting materials and low level green items to supply people training their crafting skill. This leads to both of the differences in that crafting skill levels are now account wide and you do not actually need to practice the skills to raise them, you just need gold (and eventually specific items).
With the salvaged materials selling (very often) for less than what you could sell a magic item to the merchant it seems a waste to enter into the AH in the early game. At what point in the game (Act or Level) does it make sense to start selling items on the Auction House instead of to a merchant?