In a podcast, personal finance guru Dave Ramsey boldly declared that even if offered $1 billion at 0% interest for 10 years, he wouldn't take it. That's right, not even a billion dollars with no interest could tempt Ramsey to break his cardinal rule of never borrowing money. …… "Mathematically, it might make sense," he admitted. "But I built a career and financial success on avoiding debt and I'm not about to change that now. Borrowing money is an unnecessary risk and I'm not interested in playing that game."