If you want examples of high-reliability high-traffic websites, I suggest you look at sites such as Yahoo.
Exactly. When was the last time Amazon went down? The number of page views the AIS website gets is pitiful comared with any commercial web organisation, or even the Met Office, which I have never found unavailable.
As for the idea that confidential information shouldn't be available to view over the web, e.g. financial info, that is a notion from history. Wake up, as they say, and smell the coffee.
QDM