Yes the Jars cost them pennies along with the lids. Same machinery to fill the tiny jars as it does for the jars twice their size for the most part. Why not make it easier on everyone's wallet and sell the paint in a jar that is 3 times the size? Easy answer, If it is not broke why fix it. We all have to make money to live, we get it. Some of these prices are getting silly.
Living alone and trying to buy food for one. The can goods you buy for single or 2 servings are more than a can with a serving for 4 to 6. Why, because the container and the filling is the same price. Because they can.