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.
Yep. You can earn more than regular Bitcoin signature campaign if you join with some altcoin campaign especially ICOs. They really have a much more decent rewards to offer which is really great though you will have to wait in order to get your share though you can jump on to other ICO after the campaign is over and you will await for your share in due time.