We used to have Yakult Ladies in Singapore too — I remember my parents buying from them to please their kids (me) decades ago.

Surprisingly enough, I just looked the scheme up for this comment, and it's still active:

- https://yakult.com.sg/yakult-lady-agent/

- https://sg.news.yahoo.com/memory-makers-singapores-first-yak...

The Yahoo article could help explain some of the economics behind it.