The monthly fee includes keeping your website up to date with any changes you want made. This could include things like a weekly/monthly newsletter you want published on your website, special offers, updated photos etc.
In addition, your site will require constant monitoring to ensure that it keeps coming up in relevant searches.
We will also from time to time suggest a revamp of the site, changing the content so it remains "fresh". Search engines give higher ratings to websites that have regular content updates.