A very high percentage of WT and Aw! magazines are never opened and read by anyone. Probably half of all print runs go straight into the recycling trash bins. Householders will often take the mags just to shut the JWs at their doors up - and then immediately toss them in the trash. Laundromats and company lunchrooms are regularly cleaned and the mags get dumped by the cleaning crews.
The study magazines are not distributed publicly, so my guess is that after the WT study is completed, a vast majority of those also go in the trash or are used to start BBQs or firelogs. Remember that most regular JWs will buy the bound volume at the end of the year, put it in their bookcase and never open them again. So there really is no reason to keep any old mags except to leave on doorsteps during field service so that the householders can throw them in the trash.
Part of the problem is that the current versions are so boring to read. Look at the pictures, read Questions from Readers, and then put them away. I've often said that the 4-page "Weekly Reader" that I used to get in elementary school was far more interesting and informative than any 32 page WT or Aw! - and they were for 4th-6th graders.
I'm guessing that more ex-JWs read the Watchtower more closely than active JWs, simply because we are reading it more critically, looking for the Governing Body and their non-Anointed writing department to f**k up and stick their brogans down their throats with some stupid comment (i.e., "mentally diseased apostates...") or contradictory statement.
Think of the forests that could be saved if the Watchtower would just shut down or go 100% electronic delivery. But then they could not brag about their high circulation numbers...
JV