Your logic doesn't leave room for the possibility that there is a correlation between electability and ability to raise funds. I.e. the candidate most likely to win raises more funds and not vice versa.
https://citationsneeded.libsyn.com/episode-67-the-gate-keepi...
That's circular logic. "They must be the most qualified, because they raised the most money and the person who gets elected is the one who raised the most money".
In a functioning democracy there should be a cliff where, no matter how much you spent, you cannot simply buy the election.