Low price / sales promotions
Many reviewers explicitly mention buying because of steep discounts, coupons, or 'bug price' sales (e.g. under $10, ~300-600 yen), often saying they didn't expect much given the price.
Cute packaging and keyring/charm inclusions
A large number of reviews cite the adorable design, keyring, or special-edition charm as a key reason for purchase, sometimes even more than the shadow performance itself.
Gifting
Multiple reviewers bought the palette as a birthday, family, or friend gift, citing its cute presentation and reasonable price as gift-appropriate.
Brand loyalty / repurchase
Longtime Etude fans (some since Play Color Eyes era) repurchase new colorways, and several reviewers mention owning multiple shades or repeatedly rebuying favorite tones.
Portability for travel
Reviewers frequently note buying it specifically because of its slim, compact size that fits easily in a pouch or travel bag.