I'd just like to point out that, although perhaps the XBox version would still sell better regardless, that it's a skewed statistic to suggest that the sales volumes of KOTOR are a good indication of which game sold better.
Let's not forget that the XBox version was out sooner, thus those people who own both XBox and PC would have already bought a copy, meaning less potential PC sales when it was finally released.
Think about it. Would it really be fair to compare DVD sales of the Star Wars trilogy with that of VHS sales? Of course not, since the VHS version had a huge headstart. However, if both were hypothetically released at the exact same time, I'd say it's a fair estimate that the VHS to DVD sales would be a LOT closer, and even in fact, in favor of the DVD.
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Exactly.