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(not unique)
It's important to track the uniques because it's a significant metric for judging the momentum of your web site's traffic.
For instance, although you may have 850 monthly visitors a month, but the uniques are declining from month to month, then that would be an early indicator that you have a problem brewing. It's important to keep the momentum going so that if you notice a downtick week over week, you can analyze the source of it and take some action.
Also, it's important to analyze the keywords that are bringing people to your site: Is it on target and relevant, or is it somewhat random or not too on-target? If it's not on-target for your site, that's not good because it indicates non-sustainable traffic.
It's important to mine your data for these kinds of indicators of what's going on.