If you want ransom, Mario doesn't have money. What he does have is a particular set of skills--skills that he has acquired over a very long career. Skills that make him a nightmare to people like you. If you let Princess Peach go right now, that will be the end of it. Mario will not look for you. He will not pursue you. But if you don't let her go, then he will look for you. He will find you. And he will kill you.
The YouTube channel WTFLOL offers this parody of the trailer for Taken. Slave traders from the Mushroom Kingdom have kidnapped Princess Peach and her friend Daisy. In doing so, they have angered Mario.
They've made a terrible mistake.