the thing of it is, people make the mistake and think AH is a WW2 combat sim, which it is NOT, it is a combat sim using WW2 tools....we DO NOT replay WW2 we have special events for that...the MA is a giant sandbox, for combat, and the only thing wrong with it is........
wait for it
NOTHING 
it is the players that ruin it(not that I think it is ruined I for the most part very much enjoy flying the MA), players that think it is a WW2 sim and think that staying alive is more important then the fight, so they fly very timid....it is sad really
Heh, I would say that the fact that people don't worry about dieing and pull ridiculous suicidal runs is whats wrong with it....but hey, that's me. To each his own is what I say. So yes, I will fly with the intention of bringing my plane back to base at the end of my flight. Even if that means limping back on a single engine, ditching it in friendly territory, disengaging when the horde drops in etc.etc.etc.
Its how I would like to play it, so I will. You are free to play as you would....
Oh and as for the OP, I think its just the fact that LW offers the most in equipment/aircraft that most people fly there. Then because most people are in there, the others looking for a fight will also jump in there.
A rolling plane set might actually prove detrimental to game-play since most people will find something else to do while they wait for the day 'their' favorite era spawns in the arena.