Pullip Dolls Why Are Blythe And Pullip Dolls That Expensive?

Why are Blythe and Pullip dolls that expensive? - pullip dolls

I know your intention for children and old collectibles. But like Blythe and Pullip generate for each doll? by 1000 or 100000 doll? How long does it take for a doll to take to become rare? I think the number of production on these dolls, because it's more crazy to have more people? How to produce standard normal Blythe dolls and Pullip too?