Why would you want to close it? With over two hundred based aircraft contributing to the MAG "coffers" along with the rapidly expanding industrial estate?
Many GA aircraft, major pilot training schools, several aircraft maintenance facitilities, three paint shops, numerous executive jet operators as well as Cobham etc sounds like a viable business case to me. The point is about BOH as a viable base for passenger operations not all the other airport operations. From that point of view it is one of the busiest airports in the country, and especially so for commercial training. Not to mention a very rich Qatari who keeps his two 747s at the airport - from a place where money grows on palm trees and oil wells!