Even excluding the cosmetics, this DLC includes the soundtrack. I haven’t purchased it myself (yet), but I’d imagine that a soundtrack to a game with over 200 hours of cinematic would be rather extensive (again, I have not seen it, so I don’t know). Even if it’s only 30 to 40 minutes of music, at $10, that’s at least on par with the cost of most albums anywhere else. I feel it’s got to be more than only 30ish minutes of music, though, so, for the album alone the price seems legit.