Maybe it works if you want to go for the premium aircraft only, but:
Tier 3, P36 hawk, reward 40%
Tier 6, 109E, reward: 70%
Tier 13, 109 G-6, reward: 130%
And this x1100. Will definitely make a huge difference. Now imagine you don´t manage to get the 1100 kills. You cut a big chunk of your XP and lions and didn´t get the plane either.