I agree with Bozon. I have so many fighter perk points its meaningless. I think the perk system has the potential to induce more variety in player aircraft choice, but that would require lightly perking more planes. I could see later models of the '38, '51, and '47, La, 109 and 190, and Spitfire all being lightly perked, and also resetting all player perk balances to zero or some nominal amount at the beginning of each tour. In fact I'd be interested to see an in-game economy being built around perk points - with expansion into fuel, ordnance loads, and even pilot equipment like G-suits and shaded goggles, etc. I think I might enjoy spending a bit more time in the hangar before each sortie, deciding how to allocate my points. And it might reduce unrealistic practices like taking 50% internal fuel + full drop tanks, or suicidal Lancaster missions, if pilots had to pay for the wasted items.
But I suspect the majority of players would rather have the ability to fly what they want when they want, rather than limiting choices of what everyone flies in the name of arena variety.