The smart people I know that are not rich because of one of two prime reasons:
1. They are not wealthy because they are not driven to make money. The scientist, the stereotypicial engineer, the altruist. The majority of self-made wealth I have seen is due to a real desire to make money, and work hard at it with little regard to other concerns like how enjoyable or prestigious the work is.
2. They are smart in particular areas, but really let themselves down in others. Maybe they can’t work well with others, maybe they intellectually can’t do sales, maybe they don’t keep motivation to work on a winning thing, maybe they gamble or drink, maybe they have psych issues.
Note that there are plenty of exceptions to the above (gain wealth despite the above, or lose it even with the above).
Finally plenty of smart people just don’t value money that highly - they are smart enough to have different goals in life. My guess is you want money for the social status but that you don’t actually care much about money - if so maybe accept that and choose your own path.