I hear people talk about getting AP's at Disney a lot. But from my calculations (if I'm looking at it correctly), it would take over 2 trips for our family of 6 to break even if we decided on AP's. I just don't get it. Am I doing it wrong? lol. At Universal last year, however, we upgraded to AP's for only an extra $10, so that was a no-brainer!
I think that APs are just on your radar. The majority of visitors are there on MYW passes. However, I would guess that those AP holders that you are reading about have done the math and it works for them.
You might not be aware, but the AP used to be a much more affordable product prior to October of 2015 when Disney raised the price through the roof and added "complimentary" Memory Maker to your pass.
And of course, there are quite a few FL residents and DVC owners on this forum. They get a discount on their APs, and not on MYW tickets for DVC owners, which makes purchasing an AP more attractive. Plus, there's a discount on renewals, which helps to reduce the price when their anniversary date rolls around.
Plus, as PPs have pointed out, there are additional discounts and privileges that come with having an AP. Those also have "value" to the holder, although it will differ from one person to the next.
I think that if you dig deeper, there are a lot of current AP holders who have decided that an AP does not work out for them anymore, now that Disney raised their price so dramatically, and they have decided not to renew when the time comes.