I agree to disagree! 100%!
Doing such a thing WOULD affect the income generated by the dynamics of this AWESOME mod, but otherwise would strongly enrich the game play value for a lot of players!
The devs have created something that all M&B players have wanted since the game was originally released, the ability to co op the campaign map together.
I have no problem with them cashing in on such a unique and well executed idea, but for me, the logic of your statement does not explain away the lack of ability to make this mod available for players to run the same files on a server of thier choice!