The answer is "no".  I thought I would break down the two main areas of focus on the site and go into more detail about both.

Free Samples
Companies are always looking for new ways to market their product.  For many of them, free samples are the way to go.  I just received an e-mail from a large company yesterday asking if I would put a link on my site for a free sample offer they had.  They know having a person try a product for free can often mean new customers.  The only thing to watch out for is small companies who offer samples on their website with no idea of just how popular they will be.  Often times you will receive an e-mail back from them saying they had more requests than they could handle.

Paid Surveys
If you have a little time, this is where you will get your money.  Keep in mind, you will not create enough income to live off of, but a little "fun money" is always appreciated.  These companies are hired by outside companies to gauge potential customer feedback on new products, brand appeal, etc.  Most companies will pay you for your time by either sending you money when you reach a certain amount, send you gift cards, or have you choose a gift from a catalog.  The plus is that often times companies what potential customers to try out products before they hit stores.  In the last few years I have received numerous samples, from laundry detergent, toilet paper, shampoo, dog food, you name it, they will send it to you.

I hope that this has answered some of your questions.  Have more, comment below.