How much you Earn? It depends on what goal you set? You can select for free or join a paid survey site from range $29~$49.95 for a bunch of companies list ! THE CHOICE IS YOURS. I sign up as many as possible all membership is totally free in the Web.
Why do I get paid ?
Fortune 500 companies like McDonald, Amazon, Nike, AE, these millions-dollars fat cats, know squat about their customers! So they pay people like me to tell them the LIKEs/UNLIKEs on the street. If they don't know what their average customers needs and wants, they won't have a business come in the next season.
So how do they remedy this? Quite simply: they hire consumers (like you and I) to complete survey, they pay you in return just jot down your opinions, and answer questions.
I personally do this online. I know people who have the surveys mailed to them. But I myself can logon to the internet, sign in to my account and complete a survey within 5-20 minutes, complete an online survey for about $5 ~ $20. Each day I help these companies to make millions. What I do know about is what I like. The products I buy. And guess what: That's the exact info large companies are willing to pay a premium for.
I like Online Survey which the reward is simple and straight forward, I used to join because I don't need any special skills but a computer with Internet Access, common sense like every consumers do shopping. That all!
Thousands of companies pay you to complete the surveys. It is good and safely to make little extra cash.