A greater rate of exchange of products or services (i.e. more sales) and higher profit margins (i.e. a higher sale-price to cost ratio) are highly desired by commercial producers.
In order to both increase sales and justify higher prices, commercial producers seek to portray competing products or services as inferior to the eye of the consumer, through marketing.
In order to both increase sales and justify higher prices, commercial producers of fine art seek to portray competing producers' art objects as inferior, in the eye of the consumer, through marketing.
By portraying competing producers' art objects as inferior, in the eye of the consumer, commercial producers of fine art portray consumer-created art objects as inferior in the eye of their own creators.
By portraying consumer-created art objects as inferior in the eye of their own creators, commercial producers of fine art actively demotivate the creation of objects of art by other members of society.