Instead of flipping and worrying about extra cash why not work at something that can push either your education or future occupation further. I happily traded a job with extensive overtime and driving compensation for a job in a lab at school. I'm a 4th year Earth and Enviromental Studies major. I only make $10 an hour and not even 40 hrs a week, but I get to use a GC-MS everyday and work with some pretty educated individuals. I have to wake up at early every morning and am tired every night, but I'm working towards a senior thesis and eventually going into a PhD program.
Because I don't have the experience for that yet? I just finished my 2nd year in college and most of my professors wouldn't even think of letting anyone be a lab assistant until you are at least a junior. I'm also pretty sure my job at a local laboratory over the summer helped my resume substantially, so it's not like I'm sitting on my computer 10 hours a day flipping and not doing anything for the long-term career I'm going to have.
I love how people assume flippers are just money hungry idiots because they CAN make good money. Just because I flip doesn't mean I'm an idiot. I don't spend hours, upon hours on my computer researching things. I put at most a couple of hours into flipping each day (I'll admit this has cut into my video gaming time a lot. I play video games maybe 1-2 times a week now) while having a good job (which I admit has nothing to do with my future career) and school. I would love to have my job back at the laboratory, but it was a short term job to begin with. Either way, that small-time experience isn't going to help me much. I don't plan on going for my PhD since I don't want to go back to school for 5 years, and getting accepted into a masters program is cake. I'm going to end up doing grunt work for my first 2-3 years of employment no matter what kind of experience I have anyway. Maybe if I have my masters I won't end up doing grunt work, but I plan on working for a couple of years before going back to school anyway.