Cute heart-shaped packaging
The single most cited reason for purchase across all markets; many reviewers explicitly say they bought it purely for the design ('パケ買い') without regard to the shade or formula.
Bonus mirror/keychain gift
The included mirror keychain is frequently mentioned as a deciding factor and a well-received 'not cheap' extra that adds perceived value.
Celebrity/idol and influencer endorsement
Several buyers name specific collaborations or recommendations (e.g. Haechan collab shades, Yuna's makeup tutorial) as the trigger for purchase.
Gifting
Multiple reviewers bought the product specifically as a gift for friends or family, citing the cute packaging as gift-appropriate.
Sales and discounts
Reviewers mention buying during Black Friday hauls or promotional sales periods, suggesting price sensitivity drives bulk or trial purchases.