Sorry if this is a repost (or common sense), but i thought of it, and it sounded like a nice idea.
You got a nice epic recipe (epic recipes and items, that are rare in the AH are better for this), and you go look up the price of it in thottbot/wowhead/etc. You see that the average price is 600g.
Unfortunately there is one recipe like yours at the AH, that costs 200g, so you just wait that it will pass. But the guy keeps putting the recipe in the AH.
So here is what you do:
1. Buy the recipe
2. Use an alt/different bank alt and put the recipe bought for 1000g
3. Use your main/bank alt and put your recipe for ~500g
Why do you want to do this? Because this way you can assure* that one of the recipes will sell, if a guy really wants that, he will buy the lowest.