A lot of what we do can be explained (or "reduced") to chemical processes that reward or reinforce behavior. Is there a chemical difference between this and the pleasure some get from reading great literary works, building a birdhouse, playing with your kids, etc? A key question on the ethics of it all is - I think - whether there is some externality from the behavior that leads to social utility. Reading literature…
Yes, and that difference is the whole point of art vs entertainment. After consuming entertainment, you want more entertainment. But after consuming art - after reading The Great Gatsby - your eyes get yanked back to your own life. You start thinking "what doomed dreams do I have?", not "when will they release Great Gatsby 2?"