You're not wrong. A Princeton study found the average voters have almost no impact on policy anymore. However corporations have taken over that position of influence.

https://scholar.princeton.edu/sites/default/files/mgilens/fi...

I personally believe it is because politicians have to listen to voter blocks. Since American families and homeowners have fallen to record lows they have no consistent voter base from individuals anymore. Homeowners and Familiy's used to be the two biggest voting blocks. They no longer are; businesses are the only voters that will be guaranteed to stick around until the next election.