My Art History text books suggest that art was religious in the the beginning. All of it.
Painters were journeymen artisans, hired to produce illustrations for the churches.
Otherwise, Royalty could afford them but nobody else. Big oils belong to the wealthy.
Paleo cave paintings were likely of symbolic or mystical importance, as well.
Now, along comes Marco Polo to spill the beans about the location origins of spices which had only
traveled the gauntlet of pirates along the Silk Road (apples, too, by the way.)
Cinnamon, Nutmeg, cloves, peppercorns, tea.
Read some economic botany. Even Kurlansky's "World History of Salt."
The marine spice trade made a lot of Dutch then English families pretty solvent.
Spain trawled the Americas for chocolate, vanilla, even maize and potatoes, tobacco.
They stole enough coffee beans and sugar canes to get a tidy business going in the New World.
One thing that became trendy were oil portraits. The fat cats were the patrons of the arts.
Big times we call the Renaissance..