If I need a packet of butter, I go to Sainsbury's, pick up a basket, find the butter, put it in there and then trog off to a till. There I pay and the check-out operator and I both say, "Thank you" and off I go, both of us mutually happy with the dealings between trader and customer.
I am not required to go to a separate desk and fill in a questionnaire or tell the worker there what an absolutely wonderful experience I have just had, rating it at 8 out of 10 or whatever.
On e-bay, I never leave nor expect feedback.