First of all, the amount of money you have to pay is so cheap compared to what you get, review is a highly demanding job with sharp words and inspiring readers. Reviewers deserve a minimum of 0.03 for their posts.
And in particular, you own a negative trust, and that belief says: "Trying to sell a method to cheat a casino and cheating users with ridiculous fee" (by yahoo62278), that is a bad thing, and We can hardly trust you, so if you want this service to work, I ask you to deposit and upgrade the reward. I will think back and join your service if you do.
As far as I understand he's not proposing a reward for writing reviews, but he wants someone to hire
him for the job. So if you think 3mbtc is a cheap price you can hire him or propose to your friends to hire him. I also think that around $3 for a good-quality review is not that big money for gambling site owners.