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In brief answer to your question, I guess it comes down to the 'potential' cost should you stuff things up.
Also with the Jet Ranger and other turbine engines, the possiblity of a cooking the engine (hot start) makes the insurers jittery. This is becoming less of a problem with 'automated' starts and engine control units taking more responsibility...but old habits die hard, and aviation is the biggest 'boys' club around.
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