Most people going into politics are not in a position to direct large sums of money. Therefore, "most" argument is theoretically limited by the size of the trough. If and when some of them get to the top, a very small % of people, they are presented with interesting choices! The system itself favours fusion of capital and political forces. Happens every single time at the very top? Probably not. But there is built-in bias toward that activity, around it there is a community of people, who can become veery ingenious when it comes to organising capital flows so everyone concerned gets remunerated in as low key as possible.
Oligarchs are filthy rich, civil servants and politicians are dirt poor, in comparison. Oligarchs have interests, politicians hold keys to these interests. Fertile ground for various conspiracies. Even in China, where politicians can get shot/imprisoned for betraying public interest, some of them overcome the fear and still fudging do it. What happens in the rest of the world, where that fear is relegated to history, we can only imagine.