What is the difference between your "Collector's Editions" (Akame ga Kill, Monthly Girls Nozaki-Kun, NGNL etc.) and what you call a "Premium Edition" (KoS: BVattle for Planet 9)?
There technically is NOT a difference all - all premium box sets are limited edition in terms that only a specific quantity are made. On our website, we use the verbiage "premium box set", but some of our partners describe the same product as a collector's edition.