Epinions vs. Reviewstream - Which is more profitable?

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Reviewstream USUALLY pays 40 cents per review FLAT RATE and they want exclusive rights to every review you give them. Epinions offers non-exclusive rights to your reviews however there is no flat rate you get paid, you're simply paid based off of some secret income share program they have which they won't disclose. Epinions is tempting because the earning potential doesn't have a roof unlike Reviewstream. But my issue is - is anyone making any good money with this site or is everyone earning less than 10 cents a review or whatever? If its easy to AT LEAST make what Reviewstream pays me on Epinions (40 cents a review), then I would be cool with that IF its not hard to get that. I also see that Epinions has a networth of over $1 million and makes over $1200 a day in ad revenues which is very good because it shows that this site DOES have lots of money to pay its reviewers. But the secrecy behind the income program makes me nervous.