There's also the little matter of what happens if he doesn't leave NY.
All in all, if he's not breaking any official rules, it would be best to try to suggest an alternative way of making money, such as gathering pirate pilots or raiding the wrecks around the system. Remember, in vanilla Freelancer, doing missions is one of the simplest ways to earn money early on.
Also remember that all cargo and equipment has a base value that is added to your net worth, which in turn can increase your level.
I was referring to the stuff that drops when killing other ships, especially the pilots. Some of the ones available in NY can increase one's net worth quickly early on. Makes the wait times between single player missions quite short, too.