For a large proportion of players, amateur or professional, your instrument(s) of choice are an extension of your personality. For introvert, extravert, narcissist or whatever that's going to drive your choice even beyond budget as even those with little to spend can find a bargain used instrument that's at least close to their aspirations.
Marketing things as 'pro' is simply that, marketing. I have a 'pro-user' adjustable spanner here, but it's pretty cheap. If I worked in a garage I'd probably kit myself out with Snap-On tools, but I know that Halfords kit is likely to be just as good (and has a lifetime guarantee - the one time I split a socket they replaced it no questions asked).
Plus another factor. I've got a fair few basses, one of them is a rare Fender (a Performer) and is at least as good as any bass I've played and is so easy to play with its skinny neck my playing goes up two notches just by picking it up. But it really only works for me when I'm standing up so it's never had the use of my other basses.
Both times I'be been recording a demo in a 'proper' studio the sound engineers told me to use my battered Hohner B2 in preference to the Performer because it sounded better (one said it was one of the best sounding basses they ever heard, but this was a local studio in Coventry not Abbey Road...)
OTOH I realise my flea bass is outstanding, I play it nearly every day. I change basses from time to time for the variety but I usually have two handy, and it's always one of them. This is simply because it's so comfortable (to me) and gives great range of sounds.
What I'm trying to say is that instrument choice is intensely personal and I imagine being a pro just gives you the opportunity to be more discriminating and gives you a certain licence to use what you want, not what you are expected to use. The roads of music are littered with 'Signature' models that the signee quietly puts aside after a tour or so...