Whoever decides to dedicate their life to politics knows that earning money isn't the top priority.
We can't constantly explain to our voters that taxpayers have to be on the hook for certain risks, rather than those who make a lot of money taking those risks.
To be serious, if we were only interested in earning big money then a politician would have to go and work in industry.
Everyone wants a more simple tax system. But if this means that certain tax breaks have to be cut, people are no longer so enthusiastic.