I was just browsing, and I asked the wife which one she bought. She pointed to a vase that was about a foot tall with a pearly glaze and a price tag of $2,500. 

As I admired it she asked me if I had met the owner of the gallery. I hadn't, and so she told me how charming he was. She circled around her new vase, still prominently displayed in the middle of the room, and said, "The funny thing is that this artist actually makes a lot of mistakes. See here? The glaze spread down over here and fanned up over here."

It was obvious that she didn't consider the artist's "mistake" to be a flaw, but a thing of beauty. I could imagine her bringing her piece home (it was an anniversary gift) and telling her friends about the mistakes that the artist makes. It is an interesting story, and by telling the story she will be able to look interesting too. 

That's why it so important for artists to share stories about creating art. Of course collectors want to buy something that will look good in their home. But they also want to have something to talk about.  

My suggestion for artists is to keep a notebook of specific stories from the creative trenches. Stories about working with the materials you have chosen, stories about how you came up with your ideas, even glazing bloopers. When you're ready to display your work and create marketing materials, use these stories to give potential buyers something to hold on to in their imagination.