An example of having your money work for you is to create your own mini guild of crafters from your contacts. Grab the mats from your bank or your alts then decide what will sell on the Auction House at a decent profit (I always work with a 20% rule above cost of the crafted item). Send a crafter from your personal network a request to make the item and then give a tip, selling the item on the AH for a profit.
Here is a breakdown of one such item: (Masterwork Elementium Deathblade)
With an investment of 7400 gold (5 chaos orbs at 300 a piece + 4 hardened elementium at 100 per + 2 ocean sapphire at 5g per + 8 truegold at 650 per = 7110g in materials + 200g tip = 7310g) for a Masterwork Elementium Deathblade. Selling for 9500 on most of the warcraft servers. This is one example of many that this method can be used to increase sales on recipes that you don't have in your personal character crafting list.
Want to get in contact with me? . Email me at Dragonbearjoe @ gmail. dOT com or find me on twitter at "@Dragonbearjoe" or leave a comment here. Would love to know how your experience with this works out.