I assure you, writers will write books even if nobody paid them. This is not to say it's ok if they have to live under a bridge because they can't support themselves. But writers write, and for a lot of them money is not the primary motivation, just a welcome (and important) one.
Likewise, painters will paint even if nobody will buy their paintings.
Likewise, painters will paint even if nobody will buy their paintings.
That's art for you.