I have been seeing this service mentioned a lot here on Etsy so I thought I would give it a try and share my experience of it.
https://etsy.com/forums/TrickToGetMoreSales
I went ahead and asked for a post to go out about my shop and when it did I had a bunch of messages from buyers and ended up selling several of my carvings. I even had two orders on my website which must have been the extra mention of my Facebook page because I do not list my website on my Etsy shop. I just wanted to share my experience because I still see a lot of people mentioning this service to others and hope that you can take advantage of it too.
Good luck with your shops and feel free to ask me any questions.