They include sites that seem to be their competitors because they earn referral fees when you buy memberships. A couple mentioned in scam forums even try to dupe you into buying the same list at other membership sites they own under different names. Naturally, these sites also have an incentive to exaggerate how much you'll earn from online paid surveys.
Valued Opinions – Decent site with reasonable surveys ($2 for a 20 min survey). Everyone is annoyed by this site because they tacked on a $2 few to the Amazon $20 gift card and $5 to the $20 Visa gift card so it costs $22 to get the $20 Amazon and $25 to get the $20 Visa. They claim its because of extra fees they incur. I dunno. Also, it can take weeks to get credited for a survey which is frustrating.
While product testing is offered, you’ll only get sent items if you qualify, and then it will only be a couple over the space of several months, so think of this as a bonus, rather than a regular part of your work. Some users get frustrated at the length of time they have to wait for vouchers to arrive after they order them – especially when somewhere like Opinion Outpost will pay out straight away. However it is unfortunately quite standard to have to wait weeks for payment from survey sites. Surveys range in duration from about 15 to 30 minutes and there are mini polls on the website which can help you tot up small amounts of extra points. Points do sometimes take days or even weeks to appear in Toluna accounts, which is worth noting.
That’s a really old and huge presence in research industry that has partnered with many of what are listed in this very list. So Signing up on ClixSense, you can also take paid survey invitations from multiple survey sites and research firms, like Opinion Outpost, Nielson Media Research, YouGov, I-Poll, MySurvey, Toluna and more, almost half of all those survey sites being listed here.