The problem I experience with some sellers is this. They get too busy or forget about your order. I email them again and again and get no response. I left negative feedback for the seller (since I paid and never received item). Seller leaves intentionally false negative feedback for me ("No communication. Just send an email"). Then minutes later I get an email from seller asking if we can agree to mutually withdraw our negative feedback and he will ship the item (45 days later).
How about listing everything: Positive, negative, neutral feedback received, left, and withdrawn. Then others can be the judge. If you have received AND left 100 negative feedbacks and 97 of them have been withdrawn, something is fishy.