Signature campaigns are the best way to earn some Bitcoin. Especially if you are Jr. Member or Full Member which has a high payout rate. Don't lose time with faucets. They give you very low BTC 
and how about others not only full members? bigger rank accounts have even better pay rates, what means its really beneficial to evolve your account and participate in such campaignsOf course. Newbies and other ranks can earn from signature campaigns too. I was just stating that higher ranks get higher pay. By the way...how come I have around 225 posts and my rank hasn't been updated? Any idea on how increase rank?
It depends on your activity rank. Activity rank updates by 14 counts every 2 weeks if you post at least 1 post. Next acitivity update will be on August 4.
Here is a list of coming dates - https://bitcointalk.org/index.php?topic=582736.0
After you reach your max activity based on account started date, and if posted during each period, you hit a wall. You won't be able to go up anymore till next date on activity.