This week I found that for some TB members a P bass sound cheap, this makes me think, what bass delivers an expensive sound? The value of the bass has nothing to do with my question, I want to know what is an expensive sound. Lets say that I want to sound expensive, fancy, sophisticated, a sound that only the higher economic class can appreciate, what bass should I play?
IMO, you seem to have gotten impressions from some TB'ers which are pretty much just uninformed. Anyone criticizing the sound of a P bass as somehow being associated with "cheap" is just unaware.
First of all, there are way too many recorded bass parts performed on the P, which form the foundation of pop bass playing in many genres, and which stand as testament to the misconception of the basis of your question. I don't personally play a P nor prefer that sound as an exclusive for my gigs. But, calling the P's sound cheap just seems foolish to me. Maybe, I am not understanding your question.
Second, excellent P's are, in fact, not "cheap." The better pre-CBS instruments have become almost unaffordable for working cats. The better Custom Shop instruments are high end. The boutique Fender clone build examples are high end.
You want to "sound expensive?" Go wood shed for 12 hours a day or so on Charlie Parker parts, James Jamerson parts, Jaco parts, Marcus Miller parts, Stevie Wonder parts etc; learn to play roots Blues really well; get a quality amplification chain nailed down; do several hundred gigs in a variety of genres; and then, you may start sounding "expensive." IMO/E
Now, if your question was more oriented at asking which basses have dramatic detail in the upper frequency spectrum, then you might want to look at basses like Alembic, Fodera, Tobias (MTD), and Zon etc; which have a more complex and varied tonal palette than the P; and that means you can get a larger variety of tones out of them. But, no one of any of the tones is "expensive." There are good bass tones and not as good bass tones, depending on the mix. That's all there is to it. IME