Some pay with points that are redeemable for cash or goods and typically you must rack up a bunch to redeem them for anything of significance. Others may give you a gift card, discount, or another token of appreciation for participating. Many others pay nothing or only offer sweepstakes entries for completing screening surveys to determine your eligibility for other, paid surveys. A few don't pay much of anything, unless you recruit others, as in a pyramid scheme.
The concept of data mining and profiting off that data mining isn't anything new. And while some companies engage in some rather disreputable practices to do this, Global Test Market seems to be doing just fine with the whole “consent to disclose” thing. More importantly, in some cases this may help you as some companies will offer to do more specialized product testing once they've identified you as their target demographic.
A well known survey panel, Valued Opinions is owned by leading market research company ResearchNow and is open to people in more than 20 countries around the world, including the USA, UK and Australia. The site uses a range of different languages and has around three million members busily filling in surveys and questionnaires. Most surveys taken will reward you between $1 and $5 and take up to around 20 minutes to complete, asking you about marketing, brands and products and even news events. There is a steady rate of invites to surveys, but you won’t always be qualified for them, which can become tiresome.