Our goal wasn't simply to say "Your site is broke", but to help inform you of global issues that could be affecting that answer (especially in todays world with AnyCast-DNS, CDNs, and global cloud hosting). And to further educate the site owner as to where the problem may lie.
Our current plans are to keep this tool free, and monetize the service through our api (http://api.wheresitup.com/) for sites requiring around the clock monitoring.
I am now also aware that there seems to have been a transient error between Hyderabad and my Linode. It's back up now though.