Getting a blogging job

What are the qualities of someone who blogs for a living? First of all, you need full knowledge of how search engines operate in combination with an advertising program: Adsense or Adwords, preferably. Then, you should be able to make a serious selection of the keywords and understand the way you have to bid for them: the keywords highest in demand are also the most expensive ones. You have to be able to identify those keywords that become inactive or that have a very low return on investment rate, and thus be able to get them back in use or replace them with new functional ones.