Of course they vote for their own interests. If you restrict the voting to only property owners or net worth levels then you will only get their interests.
It’s all philosophical anyway because voting was gamed a long time ago. All the different points of views, national priorities, and potential solutions for 350M people and somehow we boil those down to only two options? Red or blue.
The same two options that love to get the edges of their supporters geeked up over social politics and play the our side vs their side like a sports event. Yet what they pass into law is the taxes and interference while everyone is arguing about what they want you to argue about. Lack of choices is the same not having a choice.