Well, either Star Fleet has slipped right under the radar (and it should perhaps be borne in mind that other shows mentioned are perhaps better known in the US, and thus have a bigger potential sales market, than Star Fleet) or theres some kind of rights issue. These can be particularly tricky; every Macross fan wants to know where their subtitled DVD release of the Do You Remember Love? movie is , and some scenes in the Western release of the anime Kodocha (aka Childs Toy) are rendered literally speechless due to copyright problems with the backing track...Even Bandai couldn't sort out a music rights issue with their US Zeta Gundam release, and they own Japan!  And don't even get me started on Macross 7...!
"The power of bakers, the power of artists; even the power of witches! It must be a power given by God... sometimes we suffer for it."- Ursula, Kikis Delivery Service.