I was thinking of what luche said, and I still believe the perk price should increase.
The K/D he posted may possibly not lead to actual results in terms of my wish. I do not have the ability to dissect numbers like he does, but I feel K/D importance of this plane may not accurately show its true impact vs a large HQ raid. Other things to consider as he stated is the huge difference in player skill.
The 163's effectiveness I believe is very much understated in K/D Vs A large HQ raid. I guess that the "experts" in the 163 disrupt the average, and the actual K/D would be lower if you toss out the highs and the lows. That would seem contradictory, except for the role it is being used in. Even a subpar pilot making a dead 6 attack against a bomber stream likely has a chance of getting a kill before getting shot down in return. In this type of scenario you can "throw" yourself at the enemy, and with a 163, it takes just a few minutes to get there.
Luche pointed out that for some reason a large HQ or strat raid is largely ignored until the last moment. I agree, but a quick up of a 163 at the last moment, although effective, is still not good for gameplay. Effectively hitting an enemy's strats hugely affects the game now. So let it. The larger maps often remain fairly stagnant anyways, and the small maps are much harder to create this scenario.
I doubt it will lead to more players actually looking at their map to recognize an inbound raid, but they may pay attention to those that do knowing now it is much harder to up a last minute defense.