Politicians should be paid the median salary of their country. Not be allowed to accept as much as a cent from any other source, and not be allowed to own any stocks.
If your not happy with the median salary, work to increase it. Force our politicians to actually work for the people who elect them.

Better is a poor man who walks in his integrity than a rich man who is crooked in his ways.

it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God.