Well, SC2 covered the least popular half of her career (that wasn't unpopular, just not as popular as 3 of the 10 best selling albums of Japan :v). She is also much more a digital artist than a physical one right now... something that she is educating her public for on the last few years.
Also, the tracks on SC2 but the new EP and 3 old singles had over 1 million digital sales (+- half of them reached 2 million). People that could be interested pretty much had everything already.
People buy compilations when they like an artist hits but don't care about their albums... And she never really went through this.
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