> As long as you use the money properly, and investing in yourself is the best possible way to use money, credit cards can give you a new life.
If by using the money properly he meant investing in his business, then, what would have happened if his business instead failed (as most do)?
Incurring high-interest debt like that isn't really advisable unless you have a solid plan B to deal with it in case things go awry (which they probably will).