If we're talking about politicians suddenly getting rich when they got the position, well, they didn't get that by operating alone. They might appear helpful to the needy but most of them are giving just a fraction of the funds they're receiving from the yearly budget. Politics is a dirty game that the only handful that tries to serve honestly are easily persecuted/eliminated.
That's true, them know themselves, they know what they are doing is a game of dirty, for one to be among them or to feel among them, they have to do just like them, act like them, before one can be considered as one of them.
Even if they keep telling people to stay away from corruption outside but inside they are the ones sponsoring corruption, they are just deceiving people or misleading them, which is not good.
And while they are doing things, they are earning from it and use it to make their families to live a better life while other people are suffering from their mislead, that is why its good for one to always do the right thing and also try and invest in a better way.