When it comes to generating income from a game I suppose the biggest difference between ROF and IL2 is that ROF operates in a limited theatre over the Western Front. There just aren't the opportunities to created additional maps so all they can do is sell planes. IL2 on the other hand represents a truly world war with a number of seperate areas of operations that can be used as a base for stand alone or merged updates. The different approaches suite the different games.
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