But the difficulty is not in creating unique art. That is not a problem, this site alone is testament to the fruitfulness of people's imaginations.
SELLING unique art is difficult for the reasons you outline. And others.... I'm a painter, but I feel that the dominant artform today (nowadays) is film. If you're not working in film, or having your work made into film, you are somewhat on the sidelines of the main action. I'm not complaining, I devour movies like everyone else, and I'd be chuffed if I wrote a script that made it to the screen. It's just the way it is these nowadays. I keep on painting pictures anyways.