The absolute least expensive turbine machines, for example an R66, an old 206, or a 505, will cost you a minimum of $500USD per hour to run, wholesale. And that assumes amortizing the insurance over 500 flight hours per year. Fly less and costs go up dramatically because you pay for insurance whether it flies or not. If you are renting you'll pay $1500/hr.
It's a big leap into turbines...