I'm guessing it happened because the stars are really a percentage, so a 4/5 would count as 80%; although whenever we asked amazon 'why has xyz strange thing ha

I'm guessing it happened because the stars are really a percentage, so a 4/5 would count as 80%; although whenever we asked amazon 'why has xyz strange thing happened?' they seemed to just respond with a stock 'it's how the algorithm works'. It probably matters less for sellers who shift a lot of stuff, but there was always the problem of annoyed customers being more likely to leave feedback. It can get pretty serious because your whole account can get suspended out of the blue if your feedback goes too far south. Perhaps a better system would be to assume that customer is fully satisfied if they haven't left a negative rating after x amount of days.