about decrease of earings

I don't think so. As i was not her for last 4 weeks, and my earning was till there since my last time login

I don't think that if, let's say, you haven't posted anything for a day, your earnings will decrease. I myself am not a regular here at myLot. For several days, I haven't posted anything at all (or didn't log in at all), but my earnings still stayed the same. I think that if one's earnings have decreased, it means that myLot filtered some discussions (or have removed some) at that time (sometimes they do that late), and if the member posted on that removed discussion, the earnings will be deducted accordingly. Also, some adjustments are being made in terms of the earnings (maybe myLot has a way of checking-and-balancing things out), which is the reason why the stated earnings is not always final until the amount has been entered to the member's paypal account.