Loads of words spoken here with not much sense.
Well, in reality, at least a few of the people who have responded have either spoken with Sterling or even with me. Much more likely me. I have a lot more spare time. In any case, it's kind of been covered already, but I'll blather on a bit and see if I can add anything to the conversation.
Signature Stingray? Nah. It's a Stingray! Originally developed by Leo, perfected by BP and the crew at EBMM, very much the same beast it was in the late 70s. Who would get a signature model? It's already an icon and even guys like Flea (way back when) played pretty much off-the-rack models. What would make it a "Flea" sig? No one knows.
I kind of think - if you want to talk about who "deserves" a sig model - that Tony Levin would be in the running, but I asked him about this once a long time ago, more or less just having fun because he was sitting with a bunch of guitarists who DO have EBMM sigs (Luke, Petrucci, Morse, etc) and I was sort of implying that he was easily as big a rock star as THOSE guys, heh heh, where was his sig?
I paraphrase, but he said, basically, what would a Tony Levin sig SR5 be? Because he likes that he can go anywhere in the world, concert or session or clinic, grab a Stingray 5 off the wall and be completely at ease. In other words, Tony Levin doesn't require anything special other than being Tony Levin, which is big, of course. But basses? Give him a Stingray 5 and he's already Tony Levin.
I've had much the same conversation with Dave LaRue, come to think of it. Dave and Tony get some nice stuff, things that are one-offs and special in some ways (always cosmetic, if memory serves), which is nice. They're Tony Levin and Dave LaRue. But either one of them, I think, would agree with what I'm telling you. Grab one off the rack. If you can't do it with that, it ain't the instrument's fault.
My point is that surely not every big name MM bass player uses stock instruments?
Depends on your definition of "stock". Big name players get some cool finishes and so on, but in general, the basses are what you and I play. Which, if you ask me, is pretty damned nifty.
Does that clear it up somewhat?