Too many "if, ands or buts" to answer the question.
There are many factors involved like how many hours per month etc..... as a rough guide, mine will NOT got out dry, but wet with a pilot and crew etc.... I am looking for ball park $2,500 per hour. This number will go up or down depending upon:
1. Am I operating in a remote area and need to provide a fuel truck. (I need to factor in mileage, driver costs, cost of fuel...etc).
2. How many hours a day am I expected to fly. (One hour per day, but need to pay a pilot for 12 hour standby gets expensive).
3. How many days---relief costs after 12 days etc.
I have more than one at my disposal......pm me if you are looking to do a project and I can maybe help.