If you want to become a Master Worthy of Praise, you must be creating art on a daily or frequent basis. When you create art, some of this art will eventually become product. Product is Art that resonates with the marketplace.
For example, Michaelanglo created hundreds if not thousands of pieces of art, but he is most known for the Statue of David and the Sisteen Chapel. This art turned into product when he was commissioned by the Pope to paint the Sisteen Chapel in the Vatican City. The Vatican became his patron, which allowed him to generate income from his product.
You can make bad art and it turn into good product. You can make great art and it never turn into product. Product has nothing to do with Artistic integrity as much as it has to do with its resonance with the marketplace.