I don't own a signature bass and never have. I'm neither against them nor for them.
The closest I came to owning a signature bass (a Ricky 4001 CS) was back in the early/mid 90's when I passed up the chance to snag one new. I even played it and lusted over it. Couldn't persuade my missus at the time that it would be a good investment. We'd gone in to the music shop to try out a piano for our two boys to learn music on. Did a deal on a piano and that was that. The sequel to the story is that the piano "investment" was given to charity about 25 years later and neither of the boys took up that instrument. Hey, ho..........that 4001 CS is still out there though.