Bryan
Just a thought. You mentioned "having to pay bills", and had to put aside the book-writing venture. Understandable Sir!
Here's an idea, good or bad. A website that I use for aviation once had a "drive" via the website that folks could donate to support. Again, it was a donation and voluntary, and NOT required. However, I certainly do value the effort you've put forth for the free stuff!
If you are so inclined, you could setup a paypal account for that and "us dudes" could help support your endeavers. Like I said. Just an idea. And ideas breed ideas.
Good luck with the books. I for one will buy one when they are done - if you are selling them.