Why are buyers not leaving feedback?

[party_buzz]

Hello i am really frustrated my buyers are not leaving me feedback its very important they do. I have 4 pages of no feedback left for me. Each page shows 196 buyers and on each page only 3 - 8 buyers have left me feedback. How is this fair? I am also finding it really difficult to get my postage times up' i am getting buyers email me and abuse me because for there items took  3 or 4 business days to arrive so they grade me on that not that i posted the same day. Vic to QLD in 3 days is great delivery time and i have no control once the items are shipped. I no longer leave feedback for a buyer until they have for me the feedback is more important to my business as a seller so the buyer needs to earn it from me. I have found now i have started doing this i did have extra feedback left for me this week.