I've been selling a lot lately, mostly excess cds or things I probably won't listen to anymore, and other non-music items. As a seller, it is my job to post feedback before the seller although life being what it is sometimes this happens in reverse. However, I would never tell a buyer that I'll post it if you post it first. That's not the way it works. I've had sellers tell that to me and I won't leave them feedback. Besides letting other people know how a buyer pays or communicates, feedback also lets a buyer know when you shipped an item since I think most sellers usually post when they ship. That is what I try to do. I also use feedback to let other know if this person paid quickly for if you're a seller that's what you want to know.