I agree with both sides of the argument. (???

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I think that the current perk cost is ok. You are seeing many Tempests and Arados now because players have been collecting perks for a long time without spending them. If you can, start a 2 week trial account and see how many perks you will make flying as you usually do. You may get 70 perks in those 2 weeks, maybe less, maybe more... and you use them, get vulched... and time to work on those 202 skills

I also agree that ALL late war planes should be perked. Cheap perks that is.
P-51D, BF109g10,190D9, P38L (but only when an earlier P-38 model is avaliable), La-7, F4U-C, F6F (only when the Wildcat is avaliable) and N1K (when the earlier model of N1K is avaliable) should all cost about 5 perks each to fly.
That way you will see them on the arena, as their 5 perk cost is quite cheap (and in most cases you can even make more than 5 perks in those planes on 1 sortie).
Those unwilling to pay the 5 perks because they are saving for the Tempest or the like, would fly Dhog, P-51B, P-38D/J (I wish they were in this game), early 109's and 190's, La-5,Wildcat and N1k-1J.