By playing the AH, do you mean flipping? You dont need to do that to make gold. Crafting is still a very valid way of making gold, even lots of old world items sell well. You can resell vendor items, shirts, etc. Grey/white items will be a big thing due to tmog. Even stuff like vanilla enchants still sell because they have their uses, such as enchants for speed gear, these enchants sell for hundreds of gold with like a 50g crafting cost. Now enchants might change in DF but there are so many items one can craft that I think there will always be some crafted items that will sell for profit.