Neither can I. Micro-transactions could turn this game into a nightmare.
I still think a half dozen free planes in the MA would help boast the numbers. That would bring in the "Steam" players looking for the "free" games. More players only will help bring in more players.
I don't like youre tiered system. It's just bad for gameplay and smacks of pay-to-win.
However about the "half dozen" I'd pare that down. One fighter, one bomber, one twin engine attacker and one tank.
Has to be something you can get by in but not totally destabilizing if a bunch of newbies show up in hordes (best case scenario). P-51B, B-25C, Bf110G, PanzerIV H.
That's what I would propose. No more than that. Gives them jabo, fighter, escort, a little turn and burn, gives them bomber formations, the ability to hit towns or strats with 3000lbs x3, gives them the ability to pound targets with 110G cannons or to hunt bombers, gives them just about any role they could want without unbalancing the arena. Not the best planes of their respective eras, but good, solid planes. Leaves people with a taste of the good stuff but also shows them that if they subscribe they'll get more. More guns, more speed, more loadouts, more options in other planes, etc.