I think you’re just throwing stuff at the wall and hoping something sticks, the luxury thing was junk and now you’re scrambling for a point. Sure smarter people tend to read, if nothing else reading tends to make you smarter, but that doesn’t necessarily mean they’re eat and exercise correctly. All of these things have certain addictive aspects (mostly because they’re pleasurable at least to some people), and that addictive aspect can cause troubles. If one is addicted to reading one might be smart enough to eat properly and exercise but still not bother to do it, smart people can make dumb decisions.
It’s not unfair, it’s made up. You simply are not putting forth even remotely valid points, not in stereotype or reality.
The books as a luxury items thing comes from a guy called Chip Kidd who is one of the premier book designers — you know his work, he created the Jurassic Park dino image later used in the movie.
You will notice that in recent years all of the lurid covers that used to adorn books have been replaced by more tasteful covers.
Avid readers, in my experience, tend to be more solitary by nature and maybe spend more time feeding their minds than paying much attention to what they feed their bodies.
I've always been more interested in people who have a house full of books than people who have a house full of combs and mirrors.