If you make decisions with money riding on the answers, it costs a lot more than CPU and DB. Perhaps systems administration is somehow very cheap for you, but

If you make decisions with money riding on the answers, it costs a lot more than CPU and DB. Perhaps systems administration is somehow very cheap for you, but I'm willing to bet it is still not "nothing" - even if the cost is you personally not watching a TV show you like because you're patching the web server on your analytics box for your personal vanity domain, that's still a cost. For most operations, sysadmins are somewhat expensive, and because of that, busy. This is why Urchin was such a good idea, and why Google bought them - the proposition is to trade your users' privacy for the admin time it takes to support another internal app. There's an absolute no-brainer, assuming you don't care about your users' privacy (IIRC, they were going to sell the service before Google ate them, but that's ancient and trivial history).