You can listen to them for laughs, if you want to. If you aren't an Arbitron diary keeper, you won't affect their ratings.
Dang! You mean those radio surveillance trucks spying on people don't report back to corporate America? I thought
that was the whole purpose of those black vans. (Except in the UK, where they report "unlicensed" BBC receivers to extract fines.)
What about those frequency examining billboards that display ads based on what car radios are tuned to?