[Spearichu]

My guess as to why they didn't sell well is because you kinda have to buy the complete team. Unlike Kamen Rider or any other figuarts where you just need to buy one to get the full feel of the figure.

Rangers are part of a team and just getting one and not the others would feel odd. While something like a rider figuart can do pretty well on it's own without having to get the others from it's show. Which if that was the case than getting the whole team would be more expensive.

Again this is just my guess as to why.