No, actually, it's all in your head. No shit.
This isn't ancient times, and we aren't held to the limitations of those that would impose limits on creativity for the sake of control or relaying hidden meanings. Art for the sake of beauty is art.
Not all of it, no.
>Really?
>Who decides which art is worth millions,
Depends on who controls the world.
>for instance?
>Who decides what is "art"?
That's is an individual decision.