Giving a guy a flakker status is bad business for him as well as for you
If you stay on the surface he will be killed very quickly....the few times I decided to take planes on, the flakkers blood stained the conning tower
It is a bad investment as well, because indeed these opportunities can be spent on other more important things...
This is pretty accurate though, because, besides a short lived experiment in the Gulf of Biscay with flak-U-boats, the order when sighting planes would be FLUTEN!