i've lost 9k over the past two days somehow
Over the past 4 days, I have earned an average of 1.2k per day.
Recently the value of items have been fluctuating seriously
Maybe that is what could have costed your loss
Yes, they have. However, if you set a price, and it is kind of low, you can still earn a profit if you can afford to wait.
actually that is not why i think losing 9k was weird
somehow i gained 9k on the day before when i wasn't here either of those days