Any site needs maintenance. You could need to add news, correct some product information, add information on new products or services etc. Note, that this is important, because sites, which weren't updated for a long time create impression of being dead and it's certainly the last thing you would want to happen with your site/company. Along with this, you could track the site's statistics in SiteBuilder to measure its popularity. This feature could find very broad use - from simple traffic analysis to complex statistical analyses measuring dependence of various factors on the popularity of your site.