Hi Paul,
The exponential function builds very slowly. My cousin wrote a book 10 years ago and only recently has it gotten him some recognition. I think one of the big helpers was the ted talk he did where he talked about his work. As always I think the problem is audience. I bought a dozen books and they are all gathering dust and I wish i had a dozen more but I would be crazy to expect a different result. I describe the book as a physical index of many topics on permies, the book itself is like an inbound marketing tool for the forum. It seems like you need to get out there on ted talks and podcasts and radio shows and talk up the book and use that to draw prople into the forum rather than the other way around. Maybe break the book up and rather than try to attract everybody all at once you could go section by section for that specific audience, people that want chickens might not care about bees and its a long way from chickens to composting toilets. I wish you luck but at the end of the day people either need to have the want or you need to manufacture it in them. Maybe try noam chomsky...