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.
You may right that Hero-Legendary member on this forum could earn $50-$200/month but it depends on their signature pay rate, moreover it may run for in a short time such as less than 2 months. I guess you have a lot of ways to earn bitcoin as $100 does not satisfy for you, I would like to learn more about how to earn bitcoin, but it needs some skills obviously. Have you added : - offering services as manager of signature campaign, escrow, designer, programmer and editor.