thats the whole thought behind making it compulsory. The rankings averaged over the whole would counteract the trouble makers and manipulators. By making it a one click rating between 1 & 10 would mean that it wouldn't be a huge ask or time consuming.     What would you do?

Problem being that it would annoy buyers (maybe enough for them to retaliate by leaving unfair FB). I know nothing annoys me more than the many eBay communications that I neither need nor want.