If content is king, most people will go read a book. While there are exceptions to the rule, a website dominated by huge chunks of text without any supporting graphics or visual aids is doomed. People have been so accustomed to visuals on websites that a web page that is crammed with text is often, if not always skipped.
Definitely content is the king of any site because if content of the site is not good then it will not draw traffic. Images make it interesting to read but cannot substitute the place of content. Therefore informative, unique and interesting contents get highest priority.
The right content can attract the right market to your site, and this is what you need to do in order to be a successful affiliate marketer.
Another benefit to having quality content for your affiliate network website or blog is that the useful information that you provide will be something that other websites will be more likely to link to. Having quality links to your site is second only to quality content, as far as search engine ranking. Today, search engines like Google, not only judge a site by the quality of its content, and optimization; websites are now also ranked by how many quality links there are to that site.