At that point... they could just make it official and say "$1 net worth = 1 vote".
It's not like reality is that far from that already, when "1 person = 1 vote" can only cast their vote on a representative financed by someome with large enough net worth, then discard a bunch of "1 person" votes, and end up with "1 representative = 1 vote" who can further be lobbied based on someone's or some company's net worth.
Sydney Australia allows businesses to vote in local elections. Businesses get 2 votes, humans get 1. So you don't even need to own multiple companies to have an advantage over the commoners - it's built right into the system!