I dont know about the US
But here in Aus, you are not allowed to maintain the proceeds of any crime you've committed so if your found guilty of a crime, you lose the ability to make money from it or to keep any money from it.
Take David Hicks (Australian guy who ended up in Guantanamo after fighting for the Taliban), if he sells his story to the media then the government gets all that money because he'd be profiting from his crime.
So same deal with this guy, he committed an illegal act (hacking) if found guilty of that then the $300,000 goes to the government because its the proceeds of his crime.
Cant believe you guys dont have the same sort of thing, but then again that would make most of your company and government execs bankrupt so i guess i can understand it...