Scalzi explains why he doesn't use his vasty powers to crush up and coming writers. Short answer: he's too busy and if he tried to mobilise his mighty internet hordes, they'd just decide that he was being an arse and ignore him:
Look, when you’re an asshole to people, then other people know it. And while people generally will not stop you from being an asshole, if such is your joy, they’re also not going to go out of their way to help you. Humans see assholes as damage and route around them.
Truly a maxim by which to live...