I think what Rudo and others said pretty much sum it up, but I have something to add.
Another thing that keeps Junkers out of Kusari is that they effectively do not have a "home" there. The groups that we deal with only tolerate us out of necessity. Of course we would love to be in there and monopolize the black-market all around Sirius, but it is just not possible.
I did a couple of routes into Kusari myself a while back, parading myself under the AFA/Hogoshas noses out of spite (In-RP, of course). The GC sells fuel relatively cheap.
I agree with Rudo, though. I'd love to see some more Junker v Hogosha, Junker v FA or heck, even Junker v KSP or KNF. I'm sure we would be crushed like the slow fat bugs that we are, but it would be fun.
@Bazza: Hogosha have the Raba. I flew it once in SP and it's a good ship. Not sure how it would hold up against a Salvager though. The Hogosha can also fly Kusari Explorers, I have seen a couple myself.