We will be reviewing the way that feedback works in the future, and will take this situation into consideration, so that we can more accurately reflect positive buying experiences on the site.
This is a nice idea. The full range of postage options (1st class, 2nd class, signed-for, recorded delivery, personal collection, etc) might be a little tricky to design for though, not to mention more complicated for buyers.
We’ll have a think though and will consider what might work best.
Folksy development team