Humans have been making visual and musical representational forms for over 40000 years. That's enough to convince me there's something to it in human psychology beyond just deluded snobbery.
I think you misunderstand me. The "deluded snobbery" is in reference to the sort of people who profess to think a stuffed shark, unmade bed, or spattered paint is art, and think themselves superior because they pretend to appreciate it, unlike us mere mortals who'd toss it out with the rest of the trash. Sure, this is rooted in something fundamental in human psychology: the same thing that led all those successful & intelligent people to invest with Bernie Madoff.
Meanwhile, real artists - those who have put time and effort into mastering their craft - are doing it as a hobby (like my neighbor, who does amazing flower paintings), or making a living doing the artwork for computer games (another neighbor's kid).