Stoker:
ENY and perk values aren't determined by the factors you mention - instead, the whole thing boils down to the plane's effect on gameplay, and on how the plane actually stacks up in "end result" statistics. So the talk of the Spit XIV's impact on the arenas is right on the mark.
Yarbles:
Yes, this kind of discussion does lead to results. For example, the Ta152 was a perked plane up until recently, but after guys posted fair amounts of rational, logical discussion HT came to agree with the points and made the change. Most of the time, nothing happens -- because most of the time the complaints are endless repetitions of issues that have been beaten into the ground long ago. If you want to be heard, do your research, think thihgs through, and make a rational case for the point you're trying to make. Don't whine, show maturity, and stick to the point.