Just double check to make sure you're not looking at the daily budget. The total value it lists is usually just showing how much $ worth of ads it has served, it's so it gives you an idea of how much you have left in your budget. Obviously when it's over served you don't have to worry as much. Or under served even. I recommend using this:
http://yttalk.com/threads/how-to-get-subs-fast-through-ad-campaigns.104497/ to understand how to use AdWords, it's not a very user friendly site at all to be honest.