My pet conspiracy theory is that the monetary influence in US politics is a deciding factor in keeping it close to 50/50 as this allows for the biggest football

My pet conspiracy theory is that the monetary influence in US politics is a deciding factor in keeping it close to 50/50 as this allows for the biggest footballification of politics and thus allows politicans/donors to extract the most from people who vote against their interest just to see the other side lose. The only thing I am unsure about is whether this needs coordination (a conspiracy) or is just a systemic dynamic that emerges from the rules of the system.