I've tried cashrate.com, it is a scam?

I wanted to make extra money on the side, so I thought I'd give it a try. It wasn't what I thought it was going to be. They flood your email with millions of advertisements that they want you to respond to. Then when you do respond, you have to answer advertisements, sign up for credit cards, and sign up for trial products which most you had to pay for or you had a certain free trial period. It seems like the money that you do make goes towards paying for whatever you signed up for, so you are not really making any money because you are paying for whatever they are marketing to you. They also told me I made $16.50 but I never received a check. Has anyone else tried it? If so, what results did you get?