Case in point (you can figure that one out).
Part of the reason is, well, it's in Japanese, and a solid Japanese to English translator is needed. Another part is: that's a whole lot of text to translate. Dedicating that much time to translation is a pain. And finally, with the Saturn being quite the dead system, it's hard to find a groundswell of support which equals volunteering for this kind of venture.
Case in point pt. 2: how many members does this board have? And of those members, how many people regularly post (as opposed to asking a stupid question then moving on)? And of that smaller number, how many people post something worthwhile (or, in other terms, how many people are 'contributing' to the community)?
And so on. Many a night ago I did the math (why? because I had nothing better to do). Essentially, they were very disheartening numbers (and they were very, very conservative estimates).
As a final note, after the above prerequsites are answered, you have to keep in mind this system (the Saturn) is being pillaged as a warez console, much like roms (I think it's plainly/painfully obvious, anyways). Much like coders for emulators, it gets frustrating; why would you dedicate that much time for something that is a) free and
people don't appreciate fully anyways?