Seriously, are on line market research companies and focus groups legitimate?

I know that there is money to be made as a market research focus group participate. I have gone to many different ones during the last few years. I have made over a $1000. But these are at regular companies who have actual offices with real staff.

I am always told that you can make money answering surveys on the Internet and it is a great way to make a few extra bucks during slow times at work. But seriously will they actually send you money or are all these just a con?

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