Why did plebeians still didn't have as much power in the government as patricians?

Back then, status was a factor in your life that would matter greatly. The ranking of a citizen would mean where they were in life, and where exactly they would stay. Well, patricians were the rich society. They were all highly respected for their riches and overwhelming amounts of power. Then you had plebeians, who were the generic people. The basic families. Farmers, merchants, street sweepers, that kind of thing. They had no say in government, unlike the patricians.