We'd never address such numbers, and communicate the continued excellence of dedicated stereo products, if we didn't also address the wider world of home entertainment.
Indeed, I understand where you're coming from Joel, but you do need to look from the other side of the fence as well. Imagine someone buys WHF for the first time as they're thinking about buying a TV. They read the Supertest, do their own auditioning and then decide they agree with the reviewers and buy the TV and they're really happy. A few months down the line, they might think about buying an MP3 player and they remember that WHF did a review of some so they go have a look. Again, they find they trust WHF a little bit now, so they buy whichever MP3 player fits their needs according to WHF reviews and again they're happy. Soon, they may find they want to upgrade their mini system so they again look to WHF with ever increasing trust. Because of this, they might find they end up buying a separate CD player + amp and speakers because they've suddenly realised from WHF (especially if they've visited these forums) that this will give them a better sound...
So, over a year or so, you've potentially gone from someone who bought the magazine to choose a TV to someone who's now getting into the world of hi-fi as a result. I'm not saying this is going to happen loads, maybe one in a thousand, but those are pretty good figures I reckon from the casual buyer to the possible subscriber and it also means, as a result of the broad coverage, someone has gone from knowing nothing about hi-fi to starting their first tentative steps into it. It's just a thought...