Books are seemingly more expensive than ever but paradoxically declining in material and substantial quality (i.e., are poorly edited and printed). Buying used books is just good financial sense.

My preferred book format is also the mass-market paperback, which the current publishing industry has decided should no longer exist, probably because they found they could not charge over $20 for them.

I can also find decades' worth of quality books for prices that sometimes drop below $1 (though popular / rare books are frequently sold for more than their original asking price now, but inflation-adjusted, that is still a good deal, and much less than a new book). There is no reason to expect that just because something was just published recently that it is worth many multiples the cost of an older book. I will still buy new books to support authors I particularly like, but as prices keep going up, I find I am becoming more and more selective.

And finally, physical books do not spy on me or show me ads, or otherwise try to coerce me into an abusive relationship, like every other form of entertainment seems to attempt to do these days.

Exactly this. I'm not entirely certain AI has anything to do with it but my last book purchases have been entirely used.

Our local independent book shop got together with a couple other dozen and started a used book platform. If I have a book I don't want, I'll let them know, if they have a buyer, I just bring it to them and get a small amount of money. They take a fee for the handling and everyone's happy. A used book is usually max half the price of new and there is a decently wide selection.

A lot of online retailers have also started stocking used books as a cheaper alternative.

I don't know about globally but in the US anything that isn't sure to be a mass market item is going to be print on demand. While there's some perfectly good print on demand out there, it's often of lower quality than conventional printing.

Is that really the case? Anecdotally but I remember new releases cost more historically.

We're no longer an economy that produces things to be consumed, but rather one that produces things that increase consumption.

Could be the makings of a dark age.