I think feedback is left by those buyers who actually pretty much enjoy the process, and since I think (hope) most buyers also are happy with the items they receive when they shop here, I'd expect most feedback to be good to absolutely glowing!
I'm very, very pleased with the feedback my buyers leave me too, as their praise lets me know I'm doing not just a great job, but better than they are even used to sometimes.
And sometimes the feedback is positive, but also wonderfully funny and delightful as well, so those are like little bits of dessert after the meal is over.