I believe the impact of modding is regularly overestimated. To my knowledge Sega doesn't release their sales figures, but I'm positive that the vast majority of buyers never even enters a community where mods are distributed and an even greater majority never plays a single mod. I know, EB has impressive download figures, but we can savely assume a) that many downloaders have downloaded more than once or twice and b) that a huge percentage of RTW-mod-users has tried EB at one point or another, as it clearly is one of the most popular ones.
As for the production cost, you can get blanks at retail for less than 0,20 € a piece, bought from the producer it's even less and I don't think putting that software on the disc is such an expensice endeavor. I believe, after the development costs are earned back, even a 5 € copy earns the publisher a profit margin other trades can only dream of.
It's not like I wouldn't want them to release the source code, I just can't believe Sega (and to my understanding they would be the ones to decide, not CA) would do that in, say, the next decade or so.
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