Discipline is much more important than wealth.
Creativity, logic, strategy are important initially. But once you have decided on an approach, doing it over and over again even once it becomes mind numbingly dull, will determine if you find success or not.
I'd say the main thing people that are attempting entrepreneurial ventures struggle with, is sticking to one method and following through. Lots of people will shift tactics or methods too frequently, never really gaining any understanding in what they're trying.
An interesting tidbit I came across years ago highlighted how military experience often paved the way for individuals to excel as internet marketers. It's a surprising connection, but the inherent discipline instilled in them translates to focusing on one thing until the job's done.