Whats the point of bombing GV's at a Vbase that only has a spawn into another Vbase? If you really don't care for the ground war, then that leaves a couple of options:
1) you died on the ground, and are now out for vengence (example: Cane)
2) you die in the air AND the ground, and so are forced to bomb
3) perks
4) you hate the red guys
5) you're helping out a friend
6) you're a "wins tEh wArsz!!@1!" tard
Only two that should hold any water are numbers 5 and 6. And 6 is markedly weaker than number 5.