The Manafort case is interesting.
Usually white collar crime goes unprosecuted and high-level tax fraud is pretty easy to get away with. This is rather standard stuff for a lot of international business folks. Hide your money, do a shell game with shell companies in tax haven islands, shuffle things around, forge paperwork and make up fake loans if you're genuinely dishonest, and illegally save millions in taxes.
Manafort was cheating like this for a decade or more, and would have kept getting away with it, except for the odd confluence of national political prominence and a special investigator. This is basically the norm, and not an isolated case of tax evasion. And this will be the end of it, no one else will be audited or prosecuted.
EDIT: Juan Cole has a similar take, though he focuses on the political corruption:
Manafort’s alleged Corruption is How America Works, not Deviance