I have a few affiliate websites up promoting a few different products, and they are making a little bit of money. Nothing that big, but still respectable.

More and more people tell me that I should start using PPC to increase my income. The problem is, I don’t really know anything about this. Should I spend the time to learn and spend my money on it, or should I look for another avenue to increase my income. I am leaning towards learning PPC, but is there any reason why I should look elsewhere?