I specifically said I had made those figures up and that you should also take into account cost of materials and time. I was trying to show how a BoE recipe was a good thing and that the cost of the recipe didn't really matter if you used it properly. Way to miss the point.
Using what you said I'll go back to my original calculation and refine it.
Materials cost X. New meta gem sells for 2X. Pattern costs 20X. You therefore need to sell 40 meta gems to recoup the cost of your recipe. Better?
You're saying an uncut meta gems costs the same as a cut meta gem right. Lets say 300g (I HAVE MADE THIS FIGURE UP). If you are charging 300g for a new meta gem that hardly any JC on your server has the ability to make you don't deserve to make any profit from the recipe. You could probably charge double the price of a normal, widely available meta, hence the 2X. I know just by looking at them (and not even bothering with the math) that they are the new best metas for two of the classes I play.