outages of ecommerce sites can have huge costs in terms of lost revenue
Most people come back. Really.
Once you hit a certain level of reliability, it isnt really worth it to mindlessly keep pursuing more reliability. That level will differ for different applications.
If you are an ad based business serving up niche pornography, people will wait for you to come back online, or put up with a level of flakiness to get their My Little Pony Porn. If your service regulates iron lungs, however, your users may be less forgiving.
Most applications are somewhere between the two.
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Brian
