Nah. There are usually around 2-3 shows that don't even sell above 1,000 copies each volume every season. Regardless though I'm not sure if sales numbers have anything to do with if the soundtrack is bundled in the series. I remember Dansai Bunri no Crime Edge had HORRIBLE sales numbers but they still bundled the soundtrack in the last enclosure.
I can only guess that it's one of those shows they never planned a release for. Unfortunately there tends to always be a couple shows like that every season too.
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