I am the owner of www.etsylush.com. I would love to know how submitting listings to our site can possibly have a negative effect?
When Sellers upload their listings and they are approved, we remove the 'no follow' so that search engines are able to follow your shop links.
We also promote relentlessly outside of Etsy as we feel that this is something which is often missed by Sellers. They promote here on Etsy, via forums, treasuries etc. but do little outside of it. This is why we set up the website.
We have over 30000 followers on Twitter (various accounts), a reach of 8000+ on Facebook, Pinterest 1696 followers, LinkedIn 350+ connections and we also add your items on HeartIt, StumbleUpon, Categorian and CraftJuice.
I have many messages from people telling me that they are getting a lot of traffic from our site and they are making sales. Personally, from my home decor shop I have around 200 hits a month from just a few items.