earning 3btc in 1month then loosing 4btc at 1month too 
Haha that sounds like trading yeah. I'm earning more than losing currently but it's not far off it's because I get greedy at times when I think I see a good deal but in the back of my head i know it wont work but i still do it though
Need to have discipline when trading but also you have to analyze the market alot so that you know how prices will behave and you can move on that.
I earn about 1,5 btc per month from trading I put in alot of hours though it's not worth it as full time job.