We were a Nielsen family several years ago. Tom used to joke that we skewed the projections because our viewing habits are not mainstream.

It doesn't make sense for them to include families who don't bother to watch television. The whole thing is about recording what you watch during a week period. The data is used by advertisers to determine where to place their commercials and networks to decide which shows are getting the most viewers (hence, what to continue and what to drop). If you don't watch television you don't give them any usable data, and it would not be worth their time to include you in the survey.