Two things: first of all I doubt CA actually owns the exclusive rights to the source code of RTW: I doubt SEGA would be comfortable without actually holding the rights to the works they publish.
As for the money: €5,- includes a lot of profit. Take for instance the CDs every commercial Linux company and their dogs appear to be selling: in the example that is 100 CDs for £80,85 including shipping. That means £0.81 buys you a CD and delivery, and presumably it still includes a profit margin.
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