If they bomb stuff its never useless...... because then others can attack that area..... or defenders will up to intercept the bombers.
Those bombers pilots 'create action'
This is not what actually happens in AH. Town milkers, for example, fly pretty much unopposed ("Alert A14? - No, it's just a town milker") and nobody is going to attack the few towns behind the front lines you dropped one or two bombs on each.
For the perks... It's quite easy to generate a consistent & steady 20 perks per hour in a bomber over a whole tour. In fact that was about my average for several years (I kept records of every sortie meticulously), even though I also was doing a lot of bombing in the B-29 which brings down the average a lot. When really perk farming, I could get easily 30 or 40 perks per hour. Not peak value by that one lucky sortie, but consistently. Without having to engage any other player at all. When told the correct target, even a very much average player could easily sustain the 20+ perks per hour.
On the other hand, only the best AH fighters can think about even getting to 10 perks/hour as a
constant average.