That's kind of like my buck a day theory: If I spend x time today to make improvements, add content, whatever, that brings in $1 (or quarter, or half a buck) each subsequent day, then I'm ahead. Rinse and repeat, further ahead.
And nmfam, the unique meta descriptions won't help in getting crawled, but they might help to differentiate the pages to help get them get indexed more quickly.
What will help the crawl rate is backlinks. So? ;-)