I've sold a few bits on Etsy but for me as I was selling relatively low value crafts less than £5 (think greeting cards, paper decorations) the listing fees really ate into the cost, especially as they were due irrespective of what sold.
This was some time ago now so the fee structure may have changed.
I've been looking again recently to sell some crochet items but realistically the fees I'd have to charge to make it worth it from a business point of view means they'd never sell.
I might just have a dabble! I keep making things as I enjoy it but they are all sat in tins doing nothing. I also saw an Etsy craft fair near to where I live but couldn't have a table as I wasn't an Etsy seller.