If you used Promoted Listings, you should expect to spend $10.00 for every $100.00 in sales. We promote and under the old promotion tools and the new Promoted listings the cost has remained constant.
Best promotion tool is WORD OF MOUTH! Make sure you include a coupon on your receipts. Of all the coupon codes we ever issued the coupon attached to the packing slips is the one that gets used the most.
Good luck and Happy Etsying!
Richard
www.designsthelimit.etsy.com