Bill Gates made his fortune by being in the right place at the right time with connections from his wealthy family, and software that he first sold and then went out and bought. If hard work helped him grow his empire, great, but I wouldn't use him as a great example of what hard work can bring you.
PG Wodehouse is considered by most to be a great "fun commercial fiction" writer. Comparing him to, say, Joyce, says more about Paul than about either of these writers.
For me, I prefer this quote by Calvin Coolidge: "Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent."