Pay per click campaigns (PPC) can be very helpful especially if you are trying to launch a new product or service and do not want to have to wait for the search engines to index and rank your new pages.
Pay per click can be extremely profitable but if it is not set up correctly then it can be very expensive and offer you little return on your investment.
Ideally you need to monitor your pay per click campaigns on a regular basis and improve where you can to ensure you are not wasting any of your budget and that you have enough budget to last you through the day.
If you have a pay per click campaign set up and fear that it is not performing then I would strongly recommend seeking advice from a professional. They will often charge you a monthly fee to manage your account but this money is often saved quite quickly with the changes they make to the campaigns.