I agree with you, Brady, and added
my own thread about this some weeks ago. As I recall, the -4
was reduced in cost from 60pp to 50pp, but that I think is still too much. The F4U-4 is one of those frustrating planes (like some of the 109s and the P38L (as modelled in AH)) which cannot handle its own speed, and compresses. Quite unlike the P51D, which certainly can handle its own speed, unless you
really push it too far.
Given that neither the P51D nor the LA7 have any perk value, I don't see why the F4U-4 should cost anything. It's not as if it's easy to fly.