Usually campaigns pay max 0.035BTC per week, and on average around 0.02BTC and around 0.0006BTC-0.0008BTC per post. Why are you not hiring a escrow or a campaign manager that manages the funds, since you are fairly new and i do not think that your company has much reputation, because i have not heard of it. Hiring someone to manage your campaign, like yahoo, lutpin, decoded etc. would be also worth it for you as well, because you would help to avoid the spam on the forums. Also i think you should reduce your rates for full member accounts, because there are so many farmed of them wandering around.
You think his rates are fantastic? Nah! They are not. If you take out time to do the calculation you will understand what he is actually paying is below industry standard here.
60 posts per week @ 0.03 means 0.015 for 30 posts per week that he offers Hero and Legendary Members. Isn't that poor?