I've often wondered why ISPs bother with dynamic IP addresses these days. I'm assume that back in the mists of time there were enough people with USB modems to provide a churn and allow ISPs to have contended addresses thereby saving money. But today I'd have thought most people remain connected all the time or at least all the time during peak hours. So what's in it for the ISP? I wouldn't have thought enough people wanted a static IP address to make it a significant added value whilst at the same time most people have no need to change their IP address all the time.