Great article and I have been doing the PoD business model for about 2 years now.
I've had a couple successful shops and many that have failed as well. That's because many of them weren't niched down, I'm glad you talked about niching down in this article because a lot of people need to know that.
Alice I would love to know the names of your stores you've sold on because I would love to check them out. Also if you have any social media pages then I would love to connect with you and discuss more about this.