The ratio seems to be pretty lame. I leave it for every order I get or make, as I'm sure most of the shop owners on Etsy do.
I do have a spiel in my thank you for ordering note, about feedback. "I look forward in hearing any feedback. . ."
But often, people just aren't interested, especially those who aren't going to come back much. I do get letters back. Those are much better, but not a countable stat on Etsy.
I sure would like to see a feature, where (in part), we can link to this, or quote it. I do ask the customer for permission when they send pix, then attach it to my feed back for appreciation photos, but someone would have to know to look at the feedback I give, in order to see it.
I'd love to hear what you all have to say on this, maybe we can "break the code" here?