DH is a freelance journalist. He has contributed chapters to books in the past and edited books for which he has always been paid a flat per word rate. Now he has been asked to write a complete book for which he is being offered a small advance and a royalty. The advance would be a very small fraction of his normal per word fee for a project like this. What he would like to know is what does he need to find out before committing to this project?
Average sales for books of this type?
Normal royalty percentage?
Are the publishers likely to give him this info or is there some other way of finding out?
Any advice much appreciated!