I think it's definitely worth mentioning! I may not state Etsy specifically in my resume but I would definitely call myself a small business owner! Like someone else said, running your own business requires many skills and, if you do well, it shows you've got those skills! Plus, curious people might just check it out and, if it's put together nicely, your shop is just another way to represent yourself visually. People like that. If someone is deciding between you and someone else and they take the time to snoop, it might just be a deciding factor?!
However, I would like to add that, if you look at your shop and immediately think it needs work, then maybe skip on it until it's up to par. You wouldn't want someone checking it out and seeing not-so-great pictures or misspelled words anywhere.