Before I knew about Affiliate Marketing I wasted so much time taking online surveys. I would spend literally an hour of my day answering surveys to get paid like $2. It was ridiculous now that I look back on it.
However, it is income none the less and can be a reliable source. So for some people, $20 a month can change life drastically, so I won't rule it out as a opportunity. But be very careful. Scammers are targeting people you think taking surveys is a legitimate way to make money. While it is, Scam artists are creating fake survey sites and charging it's members to be a part of the community. Once inside you can never make any money. So be sure to do your due diligence and research the survey company.