Forbes has a slideshow of billionaire cheapskates who drive old cars, fly economy and stay in budget hotels:
Ingvar Kamprad & Family$33 billion
Country: Sweden
Ikea's pennywise founder is famous for being cheap. He flies coach, drives a 1993 Volvo and often dines at lower-tier restaurants. He also reportedly furnishes his home with Ikea's affordable merchandise. Kamprad was recently quoted as saying that the only luxuries he splurges on are the occasional upscale cravat and Swedish fish roe.
(via Digg)
(Image credit: Ikea, a Creative Commons Attribution only licensed photo from Seth W's photostream)