True, knowledge, information and satisfaction is not nothing, but there are a lot of people out there who see these things as quite useless unless they can also get something material from their free work, meaning some money.

They can't be blamed to be honest. Some of those people have limited free time and would rather spend it trying to make some extra money rather than just giving away their time to others for free.

But it's worth noting how important that free work can be and how much it can help anyone improve their skills, especially when it comes to writing.