I suggest avoid pay per click campaigns - they tend to use up your resources. I haven't personally used one, but I have several online friends that tried them and they didn't work. However, if you are a web ad publisher - you place the ads on your site - then pay per click ad networks can brign in the money, depending on how you work it. Generally, the best way to go with this sort of advertising is either in pay per lead or pay (percentange?) per sale. I have little experience with this, so you might not want to take my advice.
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