I have an Etsy shop for selling my qults and quilt tops...and other things! But I haven't sold any fabric there. I have bought fabric there. Sometimes you can find discontinued fabrics. The problem with Etsy is that it's so BIG. There will be so many pages of items similar to yours that your items may never be viewed. We all get tired of looking after 20 or so pages, don't we? You have to be patient to wait for sales. I've had sales but they are always few and far between.
Don't know if you will have the same experience selling fabric.