About "lack of promotion", as thatstacey said, it's not a lack indeed, it's a different way to promote her releases. You can't compare to AKB-family, K-Pop acts, etc, they're fresh, new and reaching the top of their carreers.
Ayu's top was kind of... 10 years ago. Have steady sales and a strong fanbase 7 years after her "it-girl phase" is really great. Overplay your songs putting it everywhere when you're not fresh sometimes could be negative.
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