I was already logged in when attempting to visit the page, though it doesn't seem to matter. Below are the lines reported by Safari and Firefox.
Too many redirects occurred trying to open "https://auth.gianbomb.com/billing". This might occur if you open a page that is redirected to open another page which then is redirected to open the original page.
The page isn't redirecting properly
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
This problem can sometimes be caused by disabling or refusing to accept
Also, when you cancel a membership, you're prompted for details but then redirected to a 404... (so um... thanks for valuing opinions and filing them in the circular file) :-P