1. The average tenure of Senator or Representative in the US is steadily increasing. (https://www.termlimits.com/new-research-congressional-tenure...) and because of how much money it takes to win an election, it’s really hard to get rid of a member of Congress.
2. Because of how both the Electoral College was designed and the design of the Senate with 2 senators per state regardless of population, if you live in a more populous state, you have less voting power.
3. The more tenured Senators have more power and they have the power to block legislation. The people of the state where the leaders live are the only ones that can oust the Senate leaders.
4. Most rules aren’t done by legislators they are done by committees led by Presidential appointees who are approved by the Senate - again appointments can be blocked by the leaders of the Senate. Many of their policies are approved and struck down by unelected judges.
5. Then there is always gerrymandering.
6. You really don’t believe politicians - many of whom basically did insider trading pre-Covid - are greedy rich people? The President himself is a billionaire.