[ShadowRider]

There were also licensing costs as well. If I remember correctly Generation Kikaida/JN Productions had considered bringing over the original series after their success bringing back Kikaider, but the costs for such a large series were too much for them as they're a rather small company, and since their agreement with Toei is technically limited to Hawaii, the small print runs on these sets makes it even harder on them.

Things have been stagnate with GenerationKiakida for quite a while. I'm sure because fan support has waned over the years. They did renew their license for V3 a couple years ago though to do a new print run. However their last new DVD set was Inazuman back in 2008. And whether or not they will ever release the sequel Inazuman Flash or any other additional Tokusatsu is still up in the air.