Can't track why Boost-Crawler doesn't work
What you're seeing may be correct behavior. Boost Crawl (a submodule but without its own drupal.org page) is careful to warn that; "Minimal crawler - expires and regenerates pages only when content is edited and on next cron run" [Emphasis added.] SO, it will track content that you have edited, not crawl the site and thereby refreshing the page cache.

Enabling Boost and boost crawl on my site, and then running cron (using drush -v cron to spy cron output) I essentially saw what you saw, in my case just my home page. Running Xenu (explained below) triggered a populating of the boost cache for my entire site. Maybe this is what you were expecting?

If you want to refresh your site's boost cache index, check out either 


xenu link slueth 
httrack 
or on Mac SiteSucker 


You didn't ask, but each of these are invaluable web site QA tools as well.