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.
now is different than before, legendary now in some campaign or bitcoin campaign or altcoin campaign are now earnings round about 400 to 500$ a month. But its much better to join in the altcoin campaign.