You're right, not getting a negative certainly is the way to go. Unfortunately, we're dealing with humans, with all their imperfections and emotions. I have had an occasional buyer who has been dissatisfied for some reason--no problem IF they tell me what that problem is. Sometimes it's a knee jerk negative feedback, though, with no opportunity to fix the problem.
No offense, but 161 feedbacks just isn't enough to experience this. When I had my first negative (back in about 2000 or so) I had about 500 FBs--a woman complained that she didn't know a book I was selling on making baby food had been published several years before, even though it WAS listed as used! My fault? I've had over 6 THOUSAND FBs since then, and occasionally I've been dinged--it's a risk of doing business. With feedback withdrawal you can fix it, and preserve your 100% rating.
My user name on Ebay is daffodildeb--check me out.