It he ninja red so you can have 2 in one sentai

Hmm...this is neat but I might just go for the Bluefin release

I don't think you need to worry about these, they are not going to skyrocket in price. The only figuarts that go up to an extreme degree in prices are relatively old figures(because they eventually sell out) and tamashii web exclusives that were underordered at the time.

And that really only applies to Kamen Rider figuarts. The most expensive Sentai figuarts are GokaiPink and Yellow, both exclusives, and they peaked briefly at 9000yen before settling back around 6-7000yen(their current level). Which is only like $20 over what they would have cost if you'd preordered.

Every single Sentai mass release figuart has eventually gone on clearance except maybe GokaiRed.

Akibaranger is an awesome show but it's still really niche.

As funny as it is (and I'm sure would be even funnier if I bothered to watch the episode of Akibaranger it's from), I really couldn't care less about these. I'm still quite content with my American release.