There are many reasons this can happen. What is your daily expense? Is it a very competitive keyword? Are you being published in the content network?
On a highly competive keyword and low budget it does not take much to run through your budget. If you are also advertising in the content network it's possible that you could be 20 in google but 1 or 2 in one of many sites used in the content network. The sad thing about any type of PPC is that it's almost a guarantee that some competitors will want to see who is advertising against them and will generate a clicks. My guess would be is that if you want your ads to run on a regular basis plan to spend tons of money. It's common that some sites are spending several thousand a month on PPC on popular keywords.
You almost have to think of it as I can afford to throw away X amount of money a week, month, year and hope you get a good ROI on it. Not every campaign whether it's PPC, Magazine, Newspaper or Television is going to guarantee results.
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