It's a nice idea, but I don't see CA releasing their source code to modders on a freelance basis any time soon. As I understand it most companies tend to be VERY protective of their source code (understandably so, since their entire business hinges on it staying a secret).
Besides, as I see it two of the main advantages of mods over vanilla are:
*Because modders work for free and don't have strict deadlines, they can put a lot more time and manpower into their mod giving it a level of attention to detail that CA just can't match with a paid staff and a shipping deadline.
*Because mods don't need to turn a profit, they can afford to focus on a niche market which only a fraction of the customer base will be interested in (such as a very intense focus on historical accuracy, or an unusual setting for the campaign).
I suspect that, rather than any deficiency on the part of the CA staff, is why the quality of the better mods tends to be higher than vanilla. I suspect it also means that if the mod teams were required to work to a deadline and a budget and cater to a broad customer base, we would see the level of attention to detail drop.
I think the best bone CA could throw to the mod community at the moment would be to release some tools to make the game possible to mod in the first place. I'm very interested to see what the standout mods for Empire will be, but I'd like them to stay free, esoteric and lovingly detailed for the time being.
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