I did some research about sig campaigns, now i know that most at the time even legendary members are not earning even 50$ per month, some of them say that they earn 100$, but that's also not interesting for me. I personally would not even waste my time to post for sig campaign every day just to get 50$-100$ at the end of the month.
Well, there are many ways to earn bitcoin and one of the best way to earn bitcoin is to join in signature campaign in bitcoin forum. In addition to that, joining in signature is best sources of bitcoin and I know that its very effective. Lastly, I recommend to join in any signature campaign because it will help to gain and earn more bitcoin.