Brands should never pay pages just to post something. It's so absurd to me. What if the post flops? You just spent $1,500 on a page with a couple million followers, and it did nothing for your brand.
Even at $500 a post, it adds up fast, because one post is never going to get you the brand recognition you need.
That's why at @findclout we don't sell posts, we sell guaranteed views. You pay for the views you actually get, spread across a whole network of pages.