I’ve been on Etsy for almost 5 years and it has both good sides and bad sides. The pros are that you can get exposure and make your art available 24/7 online. It’s nice to be able to send people to your shop site when they’re debating a purchase in person; they can think it over and find you again even after the show/festival is over. I’ve been contacted by a few large companies wanting to do bigger projects who’ve found me through Etsy—that alone makes it worth it for me.
However, I’m not going to lie, it’s a commitment that can take time to produce results. You need to be able to post good pictures and write good descriptions and for artists who produce lots of one-of-a-kind works this can get really time-intensive (verses being able to recreate a product so you only have to do all the listing work once).
I think on the whole it’s worth it for me, but it might not be a good fit for everyone. I’m happy to answer specific questions, if you have any.