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The problem is that the sites are from businesses that have not changed their sites for some anything from 3 months to 3 years.
Does anyone have sites that have been the same for anything in this range of time? If so, how often does googlebot come back to these sites?
I would imagine it is monthly for even sites that haven't been updated in a while, am I wrong?
If the business site pages you're talking about have good PR, that might suggest they have reasonable incoming links and that they get crawled pretty often, maybe daily, especially if they're in the site's root folder or close to it. Obviously this won't necessarily be the same as the frequency with which Googlebot follows the links to your pages, but monthly seems very slow even for a stagnant page.