I see the point about perking the P51, but remember the importance of retaining new players. The pony, the La7, and the Dora allow beginning to intermediate players to literally stay in the game while they learn skills. I've been playing for 3 months, and I find I can participate using effective energy tactics in these "starter" mounts. If those planes were harder to get, the more demanding turnfighters would probably be just enough out of my skill's reach to leave me VERY discouraged. I almost gave up a few weeks ago, even with the "dweeb" planes.
Vets need to remember -- a hot fight with a skilled pilot is invigorating, but to make AH work long term you've got to keep the COMMUNITY going.