Forbes magazine interviewed a few self-made billionaires to find out the secrets of their success.
Interestingly, their advice applies perfectly to building and marketing Authority Sites:
Prevent problems whenever possible. But if not, then solve them sooner instead of letting them build.
Don't try to be all things to all people. Focus unswervingly on what you do well, and you're guaranteed to succeed.
Invest your energy into your own ideas instead of comparing yourself to others or worrying about how they're copying you.