I am guessing you have, like most people who disdain all politicians, never actually met one.
I grew up around local level politicans, and yes, most were poor. One I knew made his living as a commercial fisherman. Another, a bartender. Most had day jobs.
My late mother was a Washington State Representative, for example. When she first ran, in the early 70s, it paid about $3,700 a year. If my father had not had a job, there is no doubt we would have been "poor". By the 90s, it had reached almost $14k a year. She switched to being a judge, which paid better. Her eventual retirement was about equivalent to a higher level firefighter, nowhere near as good as a cop. In my professional life, I worked with a lot of politicians all over the Western USA. None drove Bentleys.
I knew a lot of City, State, and County level US politicians over the course of my 7 decades.
Aside from a few that were born rich, none achieved wealth thru politics.
Corruption certainly exists everywhere, but, in general, in Argentina or in the USA, very few politicians get rich by cheating, and, in the US, anyway, most get caught.
Recently, Ohio Republican Larry Householder did get busted for a $65 million dollar kickback scheme. He is in jail now.