There could be thousand ways keeping or increasing members with BK.
Few years ago I got help here when I was lost in deciding a school for my kid, and now “ surfing BK “ has become one of my “daily duties “.
I don’t know Siu Sin well but still notice that she used to be nice and very helpful to other members at BK, this may not be the major reason for those members keeping their membership here but sure that has made them feeling comfortable and willing to be a party of BK’s market share in the field.