Well, to be fair the first release of First Eagles was pretty limited. I think it gave you maybe 4 or 6 planes? It wasn't until the expansion/FE Gold that it became well rounded, and of course FE2 was just FE Gold redone.
So, it's true that those who started with ROF:ICE got a better deal than those that started with plain ROF...but that's pretty much par for the course for all games. Pick any game, wait a year or 18 months for the "game of the year edition" and you can get more stuff than it had on release for probably a bit less or you can pick up the original game at 1/2 price or less (I saw RoF non-ICE going for under $20 when I got ICE). Therefore, by getting it at the beginning you basically were an "early adopter" and you paid for that privilege.
As for the extra planes, when the 2 bombers were close to release a few months back, they had a mega-sale on all the other planes and I was able to pick up every single seater ICE didn't come with for just over $30 (and I paid $30 for ICE itself from Gogamer). So, for $60 I got a WWI sim with a ton of planes.
While it's true that OFF and FE are cheaper, they're not the same type of product.