Whats The Big Deal With PlaKids?

If I counted correctly the listing has 180 PlaKids and at the current bid of $350, each is about $1.95. I mostly bought my collection of PlaKids from thrift stores on my visits to Japan and the prices of each are not far off from this current bid. Prices are either ¥199 or ¥299 depending on PlaKids.