It's not rewarding but technically impossible to detect who clicked by mistake and who did not with small amount. Are you suggesting that everyone with even one extra should have given it back? that would mean large portion of the player base where most did not even try to exploit. Now it was limited to a very small group who mostly did it on purpose.
And in case you did not read it properly what you had to do to get on the exploiter list I suggest you read it again. It was not about one or two clicks.