Meat being cheap doesn't rely much on the quality of the meat. It is because of mainstream opinion.
I will give you 2 examples.

Beef Shanks:

I noticed that beef shanks are very cheap compared to other muscle meats. But there are no added health risks. It's cheap because beef shanks are tough, full of sinew and connective tissue. The mainstream wants soft meat that they can later cook to death.

Chicken Hearts:

Chicken hearts are cheap, because the mainstream finds the idea of eating hearts repulsive. They say they are "bloody", which we primals know is obviously good.

Both of these are excellent foods
They have nutrient-dense muscle (heart is pure muscle) and also collagen-rich tissue.

So its nothing related to health, but rather basic supply and demand driven by the opinion of the mainstream.