$18/hour in san fran??
Come on they would practically be homeless
shareIt's pretty obvious in the movie that they're not supposed to be living on his pay. It's explicit early on, when his parents do that silly duet rhyming toast: they wonder how Violet could go for a guy so goofy and "without a cent" (trying to rhyme with "intelligent").
Since she's a baby academic, it's not clear how they're getting by, but I suspect funds from one or the other sets of parents would be involved.