How do US senators make money? They spend 5 to 6 million on average on election and get paid 160k?

Where's the upside for senators? Of course 160k may seem like a lot of money to a lot of people, but where's the upside for senators. What are the legal ways, mind you not necessarily moral ways, that senators make money? There's bribery and corruption and then there's stuff that's just as... show more Where's the upside for senators? Of course 160k may seem like a lot of money to a lot of people, but where's the upside for senators. What are the legal ways, mind you not necessarily moral ways, that senators make money? There's bribery and corruption and then there's stuff that's just as bad, but is legal, what or how is it that they do this? Nuances and subtleties would be helpful. I've asked this question before and have gotten answers that say that the 5 to 6 million are from donors, and that the 160k is theres. Do you really think that millionaire senators care about 160k? What's their motivation? Please don't be so innocent as to suggest "They're doing it for the future of our children". Again legal, whilst not necessarily moral ways senators make money. 10 points to the best.
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