From my experiences pages have typically gone supplemental when they became isolated doorway type pages (lost their inbound link popularity) or if they are deemed to be duplicate content. For example, if Google indexes the www. version of your site and the non www. version of your site then likely most of one of those will be in supplemental results.
If you put a ton of DMOZ content and Wikipedia content on your site that sort of stuff may go supplemental as well. If too much of your site is considered to be useless or duplicate junk then Google may start trusting other portions of your site less.
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