10 was acceptable but dropping it to 8 is just being a scrooge. If you come in from overseas with just a carry on at their acceptable 10 you get screwed over by jet star trying to finish your journey. if it happened to me i'd hold the check in line up while i unpacked my bag and put on ten t shirts and 3 pairs of jeans to get the weight down. then i'd go warn every one else in the queue and tell them to go slow getting to there seats.
BTW i weigh in at 56kg were is my 34kg of credit?