A well equipped fixed wing like the Soloy Sentinal can do 90% of the patrol and surveilance work performed by a twin engined helicopter, at a fraction of the price. That's up front procurement price, maintenance and overhaul price, crew training price and fuel price. As suggested above 50% of something is better than 100% of nothing, well 90% of something is much better than 100% of nothing, especially if it's at 40% of the cost.