Old documents online as link juice
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Each month I upload my auction catalog in different formats (word, pdf and rtf).
I have about 9 years of catalogues online that have all been indexed by Google.
In each catalog there is a link to my terms and conditions page (which has made the page authority for that page quite high in some unusual, but desired keywords), there is also many, many mentions of non-desired keywords in each of those documents and links to my domain.
Is it worth updating all these old, previously indexed catalogues with better keyword juice and more relevant links ?
Would they even get re-visited by google ?
I suppose that leads to the next question... is it worth adding each of these pages to my sitemap ? To this point I have only added my major pages, not any of the subordinate pages etc.
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That's a good set of resources indeed.
I would move forward an update part of those pages - step by step. (as long as you don't go overboard - keep the links on subject, don't over optimize and linkenize

Is it worth updating all these old, previously indexed catalogues with better keyword juice and more relevant links ?
** Relevant links yes. metter keyword juice no
as you would have the tendency to over optimize. Keep it very simple and easy as those pages with new links could indeed bring a lot of value.Again, it should really be done step by step an you should monitor the results - going overboard it might back fire.
Would they even get re-visited by google ?
** If those pages don't have any updates the crawl rate is probably low but they will get updates. You can always help with a ping, build a sitemap and submit via your Web master tools account too.
You can also check when google bot visited some of those pages if you have access to the logs.