Sarah and I have been using Amazon heavily now that we are building our new home together. In particular, we have been relying on the user-supplied ratings when making our purchasing decisions.
Today I was musing about how useful the Amazon ratings are. However, Sarah had a very good insight: "Really, who actually spends time rating all the stuff they buy off of Amazon?"
"Hmmm. People who like to waste time, I suppose."
Maybe Amazon ratings aren't all that useful...