Repurchase/loyalty
An extremely high number of reviewers mention buying their 2nd, 3rd, 4th, or 5th+ bottle, and several say they always return to this product even after trying other brands.
Large jumbo size value
Many buyers specifically chose the 400mL jumbo size for its price-to-volume ratio, noting it lasts many months and is cheaper per use than smaller bottles.
Influencer/word-of-mouth recommendation
Several reviewers cite YouTuber, blogger, or friend recommendations, or having 'heard about it for months' before trying it, as their reason for purchase.
Sale/discount pricing
Multiple reviews mention purchasing specifically because it was on special or discounted, especially for the larger jumbo size.
Ingredient/brand reputation vs. other cleansing oils
Buyers who had tried DHC, Hada Labo, Manyo, or Anua cleansing oils switched to or repurchased Numbuzin citing better performance or gentler feel.