Skyhigh
One thing that you have overlooked around the staff costs is that if the helicopter wasn't there, how many extra police officers would be required to cover the calls & ground area that it can do?
As has been pointed out, you've taken basic costs and come to an assumption without doing a proper cost benefit analysis. Anyone can make figures look bad without proper analysis.
IIRC, there is another thread about dual role helicopters and the basic premise is that it doesn't work due to delays in switching from one tasking to another taking into account an emergency HEMS response. Additionally, if the helicopter is in the air in the Police role and is then required as HEMS then you have lost that capability.
As for your final point about accountability, totally agree with what has been written by others more knowledgable than me. I think that the total cost per person in NI is closer to 80p per annum based on some very quick and dirty maths but have you considered that you have actually wasted a great deal more than that in your postings about it?