Which study would that be? This one [1] concludes “both the “ideological sorting” and “vote-buying” hypotheses are able to explain the positive correlations observed between PAC contributions and voting behavior.”
In other words, vote buying is not necessarily why votes correlate with contributions along policy lines.
Fact: You can be a CEO.
Fact: You can be elected to vote on laws.
Fact: There is no financial or divine right requirement to run for office or be a CEO.
[1] https://www.ifs.org/wp-content/uploads/2012/11/Bronars-1997-...