I have heard people earning .3 btc per month. Trading can help you earn more btc very quickly as you expect. I am reading so many threads which explains the ways opened to earn more money. Try going through the topics posted on ways to earn btc.
0.3btc in a month is really not a big amount, i can earn that amount in a month with just signature campaign if i have 2 accounts with above full member rank, but if someone has a good enough capital and some knowledge about trading then he can easily earn that amount way earlier than a month.
Which other signature campaign that you can make 0.3btc per month with?
This one that you are in only can make 0.003btc per day which is 0.09btc per month.
So the other one has to pay you 0.21btc. What campaign pays that much? Even bitmixer only pays max 0.14btc and they are the highest paying one right now.
edit: just noticed you are have senior rank so the amount would be 2x as much for that campaign then what I though you were at full member. I just ranked up recently and am more active now for the 2x increase in postings. A bit more of an incentive if you know you are getting paid 2 times as much for you thoughts on a subject.