[sc_rufctr]

It's difficult.

Most really good paid drivers are born to it. They are just naturally fast. You could argue with enough practice and passion almost anyone could do the same but,
If you've ever met a "natural driver" you'd know what I mean. They can squeeze every last bit of performance and then some from a car.

These guys (and ladies) are rare and when their talent is recognised by the right people lots of doors open up for them.