Assume you used such a service (roundtrip) once per month, and it saved you 40 hours per year.
The annual risk of dying in the helo crash (taking the numbers from above) is 12 minutes flying RT * 12 RT/year = 144 minutes per year / 60 mins/hr * 1.44/100K or a risk of dying of 3.456 per 100K years. (overstated as the figure is fatalities per 100K hours, not fatal accidents per 100K).
The annual risk of dying in a car crash if you took that instead is 240 minutes * 12 RT/yr / 60 mins/hr * 0.017 = 0.816 per 100K years.
Over 50 years, your life expectancy has been shortened by about 12 hours. (This is the math I'm least sure about.)
Over that same 50 years, the helo has saved you 2000 hours of your life, for a net addition of almost months of life (assuming, as I do, you derive no value from the car ride to the airport).
Said differently, each roundtrip saves you about 3 hours of your life, plus gives you a fantastic view of the city on the way...
