If Gibson thought they'd sell well, you can't help them, none of their artist signature basses ever has, the Epiphone JC Sig excepted, but that filled a void in the market for an affordable, vintagy long scale hollow body bass.
Likewise, none of the bass models associated with Gene have ever done well. How many guys do you know that actually play a Gene Simmons Axe or a Punisher (I have one, it's actually a very good and well thought out instrument)? Most of them probably hang at the living room walls of diehard KISS fans. And it has nothing to do with Gene as a person or a bassist (I've written it before: he's actually an above par and not below par hard rock bassist with lots of lovable old school influences), signature stuff generally doesn't do well,
it just enhances the brand with a few exceptions (Epi JC or Yamaha Billy Sheehan - another well thought out instrument).
A Flying V bass will never sell well. Done properly, it will be hugely expensive and come with a giant case that will raise issues transporting it in a smaller car. The shape is divisive and has a heavy metal "not really for a serious musician" image. How many middle age to senior citizen bassists with deep pockets will want to be seen with that thing? I know exactly one: myself!