Since I have flown and controlled (and still do frequently) on IVAO Multiplayer Network for a couple of years now, I can tell you that this feature (I am talking about IVAO/VATSIM connectivity) would boost sales of fs2 beyond any possible imagination. These two communities are rather large, where VATSIM is more US oriented and IVAO has more european members, until now they have to fly with the antiquated FSX or the Lockheed version P3D (basically a FSX Clone with some upgraded features) or X-Plane...
Imagine what aerofly FS2 with these by far superior graphics could do for these communities. And best of all, you would not have to do this yourself. They have their own software developers, just enable multiplayer in fs 2, give them the API, explain it to them, they are making their client compatible and boom, you are in business...
I would love it to fly in IVAO / VATSIM networks with aerofly fs2. And I bet, a lot of others would love that too...
Just my 2 cents.