Wowwwwww!! Such a cool idea! I see one tiny bit of a problem. Steemit is a registered trademark and the logos are copyrighted. Other than that, I think you can have a lot of success with this :) It seems so lovely. I want a cute mug.
Would you create a new Steem account to promote and give out all the news about your store? Something like regular updates on the new products, shipment situations, etc.