My in-laws are in this category too... but besides that there are still those who absolutely need dial-up as an option.
I work from home and rely on internet and phone for my job. If connectivity is down I can't host webcasts... so I pay for cable internet (even though I'm a satellite TV customer), DSL as a backup, and Dial-up from AT&T as the backup to that. There have been many occasions over the past two years where I've suddenly had to switch from cable to DSL. I haven't had the double failure yet but if I do i'm ready. As for my in-laws - they have DSL but insist they need to pay for AOL too. I'm just tired of telling them not to.