Once we have the perk system, I do not mind having every single plane perked. I mean, as Pyro stated, perk system goal is to improve diversity in plane usage. If this is true, Perk system will have to be a dynamic system, with frequent changes in values. More than a way to acquire exotic planes, I see it closer to golf's handicap system. If this is the way, I'm all for it.
Some week/tour/day/whatever you will see C-Hog is a, say, 5 perkies, some other would be, say, 15, yet some other not perked, and so on for the whole planeset.
Anyway, It's not a concern for me until I see how's the impact in gameplay.
Cheers,
Pepe