Slim-slag says "I cannot see any evidence that the pilot before you stressing the airframe is much to worry about, I'd be more worried about me doing something stupid."
May I suggest that you talk to an aeronautical engineer, particularly in regards to micro-fails etc (basically every successive G loading produces tiny failings in metal, on a logarythmic scale). Pull twice the G allowed, and you will easily expend ten times the amount that should have been. Wing spars and other rather important pieces of metal do have a finite fatigue life. Rolling G-forces - where the upgoing wing is pulling even more G than you are, also accentuates the problem.
Consequently, the wing might just stay attached during your last stupid Superman manouvre, only to be destroyed next time an innocent pilot pulls into a 45 degree turn, or hits moderate turbulence.
Bottom line is simple - Dont do it in a non-aerobatic aircraft.