You've obviously never run a business. In your analysis, you figured $10 per hour labor (which is not that much above minimum wage) but you forgot the employer's contribution to social security, unemployment, and worker's comp. A good employer also tries to help with health insurance. You've also got to consider utility costs, cost of work space (rent or it's equivalent), and other overhead. All of a sudden, that "huge" profit margin is gone.
Back on topic --
That holster looks nice. I haven't tried one of these kydex/leather combos. I have considered getting one for my SW M&P 9mm compact. Thanks for the review.