I know quite a few people with LCD's that they bought just because they thought flat panels look cool. It had nothing to do with HDTV.
They still have cable boxes hooked up to them via RF cables and not for QAM, either. Most of them have SD DVD players hooked up w/ composite (Vomit!) cables because that was what came in the box.
It pains me to see it, but I know a few as well, including my grandmother who timeshifts everything she watches...with a VCR!