He gets a steady stream of XP from perlmonks which he caches at the local Starbucks. Unlike vroom, who keeps a million XP for emergencies, Larry keeps his head down by drawing almost all the XP he gets this way. In case you're wondering where all those XP come from, some of it is from the XP you don't get when your nodes are upvoted (Voting/Experience System describes the exact amount of this tax), and some of it is from an old cheque fraud using the fictious account antivroom.
Update: I guess the question is not how he gets money from perl, but what he uses it for.
