I'd suggest, if you haven't already, sending the seller a short email reminding them that you'd really appreciate feedback. It may be real-life intruded for the seller, anything from a illness to family, or it just slipped their mind. Also as is apparent from some of the other posts feedback is more important to some folks than others. Since I both buy and sell and my feedback is over 100, I don't really worry about it. If people give me feedback that's great, if they don't it doesn't bother me.