SSG
Since you fly above FL 410, do you wear an O2 mask at all times? If you are single-pilot do you wear a mask at all times above FL350? In fact, if you are single-pilot are you not worried about the safety issue of single pilot? After all, the pilot is single greatest cause of accidents.
Stop banging on mx costs, airline engines routinely stay on the wing for 20,000+ hours. They are not overhauled anymore. PERIOD.