[elorant]

It could be an e-commerce site, which depending on the case can produce a shitload of logs. Imagine having a few hundred of thousands of users daily and you record every page they view, along with heatmaps, and whatnot. In most cases those logs should never be touched by a human in raw format. You feed them in your analytics engine, and start making decisions about your conversion. And then you delete them because the goalpost is constantly moving.