Trapping and/or shooting from the ground would be far more efficient, and far less expensive.
You think that you can kill the same amount of hogs in two days by stand hunting and with traps that you can in a helicopter?
You can kill the same amount of hogs in a matter of hours using a helicopter that would take you a week or more by more "traditional" methods.
If we can eradicate these by spending more in the immediate time period, it will save a whole lot of money in the long run. Therefore, it will not be more expensive, and it is much more effective.