From being on this site for a good few years now, what I have seen is that the P Bass is hugely popular, possibly the most popular individual bass. What I have also seen is people turning over Jazz Basses in a search for the ultimate one - pick-up placing, neck profile, binding, blocks, maple/rosewood. Then they enter the realms of active, so again, pick-up choice, pre-amps, wiring. Those seriously afflicted then get into the 'Super Jazz' market.
The P Bass user knows a P Bass sounds like a P Bass and just gets on with it (until gas kicks in and they want another one)!