If you are looking for highest paying surveys, then you must join Harris Poll Online survey panel. Harris Poll Online is a well known market research company and has been in business for more than 50 years. Once you join Harris Poll Online you will have opportunity to participate in paid online surveys, focus group studies and paid product testing opportunities.
It’s a very well-known scam. You cash the check, then they ask you to either wire some of that money back to them as some sort of fee or buy something for them and send the item to them. So, you deposit the check, then wire some cash to them thinking that the check you just deposited will cover that. A few days later, after you already send them the money, the check will bounce and the money you send to them will come out of your own account.
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.