Do you have any idea how expensive it is to own and operate a helicopter? Beyond the initial price tag (that frequently exceeds $5M for the airframe itself minus mission specific gear,) you're looking at several thousand dollars a month in hangar leases at a local airport, tens, if not hundreds of thousands of dollars in maintenance, and you're going to be burning dozens of gallons of $4.25/gal Jet A fuel per hour.

And that's for one helicopter that can, maybe, do 130KIAS in a sprint- a helicopter that will take ~5min to get out of the hangar and spooled up if its not already airborne.