Information that is necessary should be free of charge. To profit off of something that should be available to everyone, something that is so important everyone should be in possession of a copy, is to defeat the purpose of your message.
Information wants to be free.
For those who have a truly meaningful message they will find a way to make it free and distribute it for as little to no money as possible.
This is why, with anti-racism work in particular, anyone who is doing it and benefiting from it especially financially benefit, is to be looked upon with dubious intentions. Someone who is benefiting from a message is often false in their believes and motivations. Someone who is willing to do work for free and distribute materials for free clearly have no motivation other than passing on that information, sharing, and educating the community to better society.