Vocabularies are required because thats how the module works; it compares based on terms (in this case, limited to specific vocabularies of terms). The module doesn't compare based on CCK fields.
Although that'd be an interesting discussion in a new issue on "relevant content" based on arbitrary fields... in D7 this would, in theory, be much easier now everything is a Field / Entity pair....
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nicholasthompsonVocabularies are required because thats how the module works; it compares based on terms (in this case, limited to specific vocabularies of terms). The module doesn't compare based on CCK fields.
Although that'd be an interesting discussion in a new issue on "relevant content" based on arbitrary fields... in D7 this would, in theory, be much easier now everything is a Field / Entity pair....