I am moderating a book blog with a team of two writers. But the number of requests for book review are increasing day by day.. I am already paying writers of my blog. Now I want to add some cost for book review. But I don't have idea how much should I charge.. Is it good or not?? Authors will feel bad ?? because I was posting for free before. I am still ready to post spotlights,guest blogs,interviews(questions are provided by me),any book news for free. But book reviews really take time and you have to be very careful.. I daily refuse 2 authors for review due to lack of time.. I don't know how much should I charge and what impression my blog will have after this.. because all authors love my blog. And they have told me this in emails many times. Please help?