How are you getting your links? That's going to be the big problem, keeping up your motivation to find/add 30 new stories every 24 hours on a site that's bringing in maybe $50/month for a while.
I would use every API out there to try and source stuff. See if you can find a way to get the most shared links of the past 24 hours from twitter, the top X stories from digg, latest post(s) from various blogs that have the kind of content you're looking for. Find a twitter account the equivalent of
www.twitter.com/newsycombinator that does nothing but push popular stories in a niche. Follow that (it will be cool anyway, trust me) and make note of the couple links a day that may match up.
As someone who does content creation on his own, even just for no-money-involved blogs I like to write, stuff like that is going to make a big difference for you. It's hard to be motivated all the time.