No, if your blog is always informative and interesting to others, you may get some loyal readers that boomarking your blog, and then regularly visiting your blogs. Even those visitors may not click your ads, but then your blogs can participate in those pay by impression, where each time the ads is showed in your visitor screen, you already earnings some money. A good blogger can even retire from his main jobs and only rely on his blogging income which is much more bigger than working.
Put my blog participate in pay by impression? it is a good idea, but i don't know which site can offer such promotion. what about the rate?