Better add my take 
I’ll happily pay $50 as long as the review is clearly done by someone who knows their onions. I’d rather pay $50 for a casino review done by someone who actually plays there and can point out the good and the bad, or review a game in a similar fashion, than $25 for some fluffy stuff you can read on any website or get just by looking at the casino for 5 minutes.
That said, if I was just after extra content and didnt really care too much about the text a) acting as the conversion tool or b) giving an honest and *useful* opinion, then I’d probably be inclined to do it myself rather than pay. Unless I was short on time, in which case I guess $25 pays for the time.
I voted $50 on that basis, but I’d probably pay a little more if it was really good.
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Now the reason I asked the question was I’ve been toying with the idea of providing a match-up between players and affiliates. Strikes me a number of affiliates need content, players should in theory know their stuff and might tlike the idea of earning some gambling money, so maybe they can help each other. Although the way the poll is panning out, I’m not sure it would be a worthwhile task.