With apologies for multiple hides to avoid a wall of text
OK, so here's a quick rundown of the reason anime DVD prices in Japan tend to be so high, as retold by my vague remembering of various "answerman" articles over on anime news network.
[HIDE]First of all, it should be noted that the entertainment industry in Japan is very much an 'old boys club' that will resist any people or technologies that they think could pose a threat to their profits. For example when netflix tried to establish a Japanese branch, all the major content producers in Japan refused to license anything to them at all. The Japanese music charts are still dominated by CD sales instead of downloads. Most relevant to this conversation, Japan is one of the last safe havens for the old fashioned video rental shop.
I'm sure everyone reading this knows the frustration of having to sit through the unskippable text at the beginning of a video that tells you the disk is a home video version and must not be rented. The reason for this is that the version sold to the rental companies are WAY more expensive, as the rental store will slowly make that money back over time.
Anyone who follows the weekly anime streaming over on Crunchyroll and/or Funimation will tell you it's very easy to regard the medium as disposable without realising it. You get into a pattern of watching the latest episodes, discussing them, and then a new season is starting and you start watching new shows instead. 9 times out of 10, by the time a show comes out on DVD you've long since moved onto something else.
Back in the VHS days this resulted in something slightly unusual in Japan. People who wanted to watch an anime after it had been on TV increasingly rented the shows instead of buying their own copy outright. It eventually reached the point where it simply wasn't commercially viable for anime companies to release a home video version - even when they ordered the minimum number of tapes they couldn't sell enough to make a profit on them. So they stopped bothering and only sold the more expensive rental version. The few people who has still been buying the tapes tended to be the more hardcore fans, and some of them were even willing to shoulder the cost of the expensive rental tapes in order to add a show to their shelf.
The situation continues nowadays. An anime's DVD sales will usually be to a vast number of rental stores and a tiny number of collectors. All at the more expensive rental price.[/HIDE]Relevance to tokusatsu sales in Japan:
[HIDE]My understanding is that DVD sales in Japan for both Rider and Sentai seem to follow the anime trend. There will be some hardcore collectors out there but most of the time if you want to watch an older toku show, you go rent it. So most of the DVD releases are the more expensive rental disks only. As rental stores will want to offer the entire series to their customers it makes DVD sales very consistant (and mostly unrelated to the broadcast viewing figures).[/HIDE]GK and Shout:
[HIDE]It's also worth pointing out that Toei don't give licenses for their shows away cheaply. A number of years ago Crunchyroll did enquire about streaming rights to Kamen Rider, and the quote they got back was similar to the kind of hyped-up "guaranteed hit" anime. So I'm guessing Generation Kikaida had to pay quite a high price for what is a tiny niche market in North America.
However, Generation Kikaida likely knew what audience it was targeting - fans who remembered those campy foreign super hero shows that were on TV back in the day and would probably have already been buying overpriced 'grey import' copies of the Japanese releases (which as discussed above were already expensive to begin with). Those people were already willing to pay the inflated prices and so GK could charge more for DVDs in order to earn back the licence fee and turn a profit. And who knows, maybe they could lure in some of the bootleg crowd that had only seen toku on battered and faded VHS tapes (usually raw or with hk subs)?
Shout Factory tends to operate on a completely different business model. They buy 'em cheap (the licenses) and sell 'em cheap, knowing that to do so allows them to make a profit across the entire country, even if the margin on each series is super slim. And let's be honest, with all their legal fees to pay Chaiyo were probably glad to have any money at all coming in. :redface2:[/HIDE]