How much commission do you offer?

[brian]

How much commission will you offer for a book whose price about $50 (for sale)?

It depends on the product. If the product is hard to sale and in a niche where everything needs much effort to get done then commission rates has to be higher. While in an easy niche where your product can get sales easily or the marketer doesn't have to work much or put much effort, there commission rates can be lower in a significant amount.