I’ve had bad experiences with iPoll. I’ll answer the “screening” questions and am told I qualify to take the survey, then once the survey is around 90% complete, I’m told the survey is “closed”. My guess is this is how they’re getting their data without having to pay participants. I’ve also gotten “invalid website” in the middle of some of their surveys as well, of course, after answering 15 minutes of questions.
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.
Companies, brands, and organizations from around the globe are constantly seeking the opinions of people just like you to help shape the products they develop and how they market them. They count on paid online surveys to provide them with reliable information. If you spend time online and enjoy giving your opinion, paid surveys are a great way to earn a little extra cash while helping these companies.