Jim ,we may differ on that point ,and its a valid point you make...BUT I have not had any problems with my feedbacks , as a buyer or a seller (so far)...I only have about 180-190 responses (actually more, but some from multible deals) , but a solid 100% positive (so far...)
If I were to buy something from You and You state up front: "I will not give feedback until you give me positive..." I would be leery dealing with you... I`d be wondering: "why"?