The problem the Starviper had is that it's a relatively unknown ship with a comparatively small fan-base, in a just-starting-out faction. So yeah, it was a good thing they put autothrusters in there or they'd have sold a lot less of them.
Remind me how many people knew what the jumpmaster was and even if it had a fan base? That line of logic is flawed. Some people do buy ships based of nostalgia or personal aesthetics, but it's a miniatures game. People will buy the model if it works, and does what is needed.