It seems like human.io solves a very rare problem: "I have a lot of people who will do whatever I ask them to, but organizing the result of their efforts is difficult".

This is a very real problem for the people that have it. Imagine you have a following of hundreds of thousands of people (like joshu actually does). You could do a lot to help yourself and others simply by posting one tweet. But then you have to deal with lots of replies from different people in different formats, keep track of it over time, set up consistent systems for recognition and reward, etc.

human.io turns all of that into an api like process. But you have to explain that idea to a very large number of people, when only a tiny percentage of people even understand what the problem is like. I can understand how this would be difficult to "explain". It seems like the problem isn't so much the message, but the fact that such a specific problem has to be explained to a wide audience.