Because of combined factors: people as a collective are stupid, elected lawmakers and political parties are incentived to keep the status quo, and you only need

Because of combined factors: people as a collective are stupid, elected lawmakers and political parties are incentived to keep the status quo, and you only need 50%+1, or less to be elected in democracy. The wealthiest only need to cater to politicians, then keeping 49% people slightly above the pull force even less, and it'll keep the condition like it is. But still there's no better governments than democracy right now.