Wiktionary
bad money drives out good
prov. 1 Debased coinage (with low levels of precious metals) replaces purer coinage (with higher levels of precious metals). 2 (qualifier: metaphorically) Mediocre talent drives away real talent.
Usage examples of "bad money drives out good".
A Solarian maxim covers the situation, perhaps: 'Bad money drives out good.
Ruthlessness drives out restraint, as bad money drives out good, until we are left using madness against madmen, with the death of all that lives as a prize.