6 copters may seem excessive (2 for sale.. keep that in mind) but the interview in the article hints at something that is not specifically stated when it is stated that using less than 6 would "wear out" the aircraft. It may be disingenuous to merely hint at what is ment by that then to print it outright.
Aircraft are rated by flight hours in a similar way that cars are valued by miles driven. If the police were to operate with the bare minimum number required for the desired 16 hours/day coverage (actually I had heard that had been dropped to 12, but maybe I heard wrong) then 2-3 choppers would be absorbing 5800 flight hours/year (and all the associated maintenence costs required at certain hourly intervals for each). If one spreads that out to 8 choppers (2 older ones are being sold... remember this... it's important) then those choppers will be HALF AS OLD when they are resold which equals greater resale value.
The resale on these things is a lot of money, and it MAY be, but I do not know for sure, that they are planning on using aircraft with higher resale value after a few years to allow the city to continue upgrading the fleet less expensively than having to totally replace aircraft that have worn out. A planned turnover of a percentage (1/4) instead of worn-out replacements of 1/2 or 2/3 of a fleet that are nearly worthless.
I.E. saving taxpayer dollars.
The value of the aircraft themselves becomes painfully obvious to anyone who simply listens to the police scanner for a few days... VERY rapid response + the ability to stay on top of something and pin someone to track or limit their movements = more crooks busted. Most chopper runs are burgler alarms and "xxx in progress" type calls, including following reported drunk drivers to avoid high speed chases (one of which that I overheard turned out to be a certain ex OSU footballer with a carload of guns) the rest I have heard have been calls to help search an area for someone. I have heard on more than one occasion the chopper arrive well in advance of officers in cars, light up the area to make sure nobody can leave without being seen and direct officers to where they are hiding (in one case I heard a convenience store near my house) to make an arrest.
No... There are a number of things NOT reported in that article: The number of apprehensions assisted by aircraft, the estimated resale values of the aircraft, the estimated replacement cost of new aircraft... etc...
in conclusion, this is an article with no real facts except the cost of operations of the aircraft unit, and comparisons to other cities that may or may not be "apples to oranges" comparisons attempting to draw a conclusion that is unsupported by the information reported.
More information is required to form an valid and informed opinion on this. I personally would like to see a more detailed reporting of this before forming any conclusions.