Supplemental sites are part of Google’s auxiliary index. We’re able to place fewer restraints on sites that we crawl for this supplemental index than we do on sites that are crawled for our main index. For example, the number of parameters in a URL might exclude a site from being crawled for inclusion in our main index; however, it could still be crawled and added to our supplemental index. (Google Webmasters Blog)
The index in which a site is included is completely automated; there’s no way for you to select or change the index in which your site appears. Please be assured that the index in which a site is included does not affect its PageRank.
This basically means that Google will see your page results as secondary. Some of the causes include: not being linked to enough, duplicate content, or no content at all. An indication could be if your website gets the gray N/A status when you go to check your pagerank on sites that check it like SEO book, or the Google toolbar. Other reasons for N/A are banned by Google, and not crawled by Google bots or Google spiders yet.
What can you do? Put up content, link to your website from other relevent sites i.e sites that have decent to good Pagerank, edit your content so it’s not stolen and Google doesen’t filter your articles, or try your lot on another domain.
JF Web Think 