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I'm not familiar with those sites, but I suspect shakran is correct.
If a research organization wanted opinions so badly that they're willing to pay for it, it seems to me they might spend a few bucks on advertising. The middle-man is not needed. In other words, you shouldn't be hearing from people claiming to put you in touch with researchers, you should be hearing from the researchers who are so desperate to get your input.
Another thought is that if the research group was willing to pay for fresh opinions, why wouldn't they pay the middle-man? Corporations pay job placement firms (read: head-hunters) to bring in new talent. It just doesn't make a lot of sense that you should be the one to fork over the cash.
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