This reared its head again lately. I was pleased with the coin, but the postage, normal internal UK, was quoted as £5. I tried to give neutral feedback and stated I thought the postage excessive, but fleebay insisted on a 'dispute' and would not allow the feedback to stand. Anyway, as it happens, I was OK with the overall price but objected to 'positive feedback' so I've just not sent any! So it appears the practice is widespread and condoned by ebay!