The banana is a sign that the rich have run out of things to spend money on.
Besides most art nowadays is a sophisticated form of money-laundering. I have seen people put their Superannuation (401k) in art and it magically grows by an absurd amount in a few years.
https://www.nytimes.com/2016/05/29/...-art-collections-hides-behind-this-fence.html
People complain a lot about art but as an investment it can be great, and as a form of entertainment it can also be rewarding, especially if you try and completely ignore what it cost/is worth/you've been told about its meaning and place in history and just form your own ideas about it. All that other stuff just drags it down and has nothing to do with the actual art. You can end up appreciating stuff for what it is - sort of like when you go for an expensive meal in an upmarket restaurant and go "meh", then get an amazing meal made for pennies in some back street in Asia.