And while it is a neat tool (I installed it on a low traffic site as soon as I found out about it, similar to my trial of HitTail.com), it is not yet a complete tool. Web masters and designers will still need something that can analyze logs (and I postulate that 103Bees.com will need to go that direction to get people to pay for their product), and probably another package or two to worry about click fraud.
A much better tool (right now), would be Google Analytics, or even AWStats, both of which are free, excellent log analyzers.
I doubt Seth (or anyone with a large website) is running their site solely using just one tool (103bees.com or even Web Side Story). Most of our sites use two or three of these tools at all times, to ensure that the short comings of one aren't hampering our real growth. [This comes with its own set of problems, of course.]