I don't think you guys are clear on where the ENY values come from. Although they had to be assigned some value at first, the ENY values are now driven by the players in the MA. I can't find a confirmation on the AH web site, but I'm pretty sure it just goes by how much a plane is flown comparatively speaking.
For example, the C.202 is rarely flown at all, so it has an ENY value of 50 last time I looked. My Jug was about 31, and the F6F-5 was only 12. Now if the C.202 suddenly became everybody's favorite plane for some reason and lots of folks started flying it, it's ENY value would quickly drop. Just the same, if nobody flew the F6F-5 anymore it's ENY value would quickly start to rise. The reason the Seafire's ENY value is so much lower than the Spit V's is simply that many more people are flying it due to the newness of Carrier ops.
These are dynamically adjusted values based on what planes are being flown the most in the arena, I THINK. I could be wrong, but I'm guessing this is how HTC is doing it. I suppose they could be using plane vs. plane K/D rations as well, but I don't think that is the case.
This system is great because it is self-adjusting to a large extent, and gives pilots who fly the lesser-used aircraft bonus. It provides some motivation to fly a more varied selection of aircraft in the arena. An arena with a nice varied selection of aircraft is a good thing, and this is a way HTC can help encourage that without keeping folks from flying the plane they wish to fly.
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "A pig is a jolly companion, Boar, sow, barrow, or gilt --
A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
When they've blackballed, bamboozled, and burned you, When they've turned on you, Tory and Whig,
Though you may be thrown over by Tabby and Rover, You'll never go wrong with a pig, a pig,
You'll never go wrong with a pig!" -- Thomas Pynchon, "Gravity's Rainbow"