I've just added an extra janitor job to the game, which you can take part in any time after the girl games audition is over, by checking the noticeboard. Between that, the art job, and the cash from your parents, you should be able to get a steady stream of money coming in without the cheat code, which is really just an extra little "thank you" thing I set up for those supporting me on the $1 patreon tier.