I think it's really hard to earn $30 to $100 per day but it was not impossible if you work harder and have a knowledge on how to earn more. Bounty and signature campaign, you can earn more but not daily. Multiple account in bitcointalk but separate all in services like signature and bounty. And also if you are good in trading and mining. You can earn $30 to $100 if you have a good understanding and have a special skills..