Profit From The Gray Area

If you're leveling any skill you know that crafting certain items stops offering increases in skill level. When they do that they are colored gray. How do we make money on that?

In professions where you have to turn a raw material into something else to use it (mainly mining/smelting), you can instead sell the raw material, ore, on the Auction House and then buy the bars you would have made.

Copper ore sells for about twice as much as copper bars. Why smelt copper bars and devalue your ore if it's gray gives you no skill? Sell that 20 ore, buy 40 bars, then craft twice as much you wanted to craft.