The only people in their right mind who would subject themselves to the ungodly dignity/torture of coach travel rather than business would be those who don't have money and can't afford the significant difference in comfort that you get in business. I'm 5'6" (short), and travel about 140K miles/year, and I can't think of anything I do each year more miserable than sitting in coach for 14-16 hour flights.

But note - I'm not suggesting that you are making the wrong decision - just that you are making it because you have to think about the cost of flying coach, you aren't at "L3" wealth and so need to think about the marginal value associated with the money you are spending. 99% of people at L3 don't hesitate for a second to book a business class ticket. (In fact, when you are truly at L3 you probably consider flying first class (emirates has awesome First Class Cabins) - or, if we want to stretch the definition a little, opting out of flying commercial altogether)