Mustng2 and I do a fair amount of attack runs.
These are WAG from experience.
The chances of losing a wing, wounded or other plane part dropping ammo bunker, Hanger, killing radar on the first pass. on a small field or town 1 in 10 due to auto ack.
The chances of losing a wing, wounded or other plane part dropping ammo bunker, Hanger, killing radar on the first pass. on a med field 1 in 5 due to auto ack.
The chances of losing a wing, wounded or other plane part dropping ammo bunker, Hanger, killing radar on the first pass. on a large field 1 in 3 due to auto ack.
The chances of blowing your self up because of dropping bomb error goes up dramatically if being chased.