User blog comment:Jkphantom9/OFFICIAL: Japanese Cast Announcement!/@comment-25555436-20150610185404/@comment-25555436-20150612034656

That's why I said it would be more effective in JP.

Here with RT, most people that would watch RWBY would be anime fans, otakus and weeaboos, before any other kind of audience. However, most of RWBY's jokes are more of RT In-Jokes, especially in Vol.1. And, most anime fans, otakus and weeaboos out there don't even know who is RT, much less about any of their other productions and as such the in-jokes fly right over their heads.

But in Japan, where nearly everyone watches anime in some way and many people are aware of the VAs and the anime companies because Anime is such Serious Business there, if they made their own In-Jokes in Japan when dubbing RWBY, most people would get at least some.