STILL confused about earnings

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Sorry to bug but I am still trying to figure this out. Can you explain this one to me if you know? One day I posted about almost 20 comments, my norm is about 25. I only earned $.02 that day. I gave someone a negative, a FIRST and LAST but I felt the discussion wasnt exactly nice (rathere nasty). The next day, at random my account went from around $4.63 to $7.01 in front of my very eyes NOT in the morning and changed on me. Last night, I was having a crap time posting stuff. But I did MORE than the norm. I posted 30 comments THIRTY! Thats a good like 3hrs worth of stuff. I thought they were all good things and such. I come on today and see yesterday they paid me $.20???? How the heck did I get down to twenty cents? I have a 7 star which is pretty nice, and I know I dont post one liners either. I know I answered a few with a lot of good words I thought were helpful. I thought I was past the $.01 a post or less seeing how long I have been doing this and such. But figuring it out. It means I got $.01 a post yesterday and some I didnt get any or less than a penny! How is that possible? I am SO confused! And NO I didnt do a negative, I will NEVER do one again. It hurt me I am guessing too much. Please help if you can, thanx!