Because we’re hot.
No, the reason is that successful freelancers are reliable.
Our clients can count on us without question. They turn to us again and again because they know that we’ll execute what they want by the deadline they need.
They know that if we can’t do that for any reason we will communicate with them to fix the problem or request a reasonable extension.
Just as the sun comes up every morning, a freelancer answers her clients’ email promptly and professionally.
So, basically, to succeed as a freelancer you need to be as dependable as a giant, fiery ball of gas.