You can also self publish print books.
There are companies that can print one-offs.
That said, coming up with a saleable book isn't easy, just ask
Perri Knize (Grand Obsession) or Robin Meloy-Goldsby (Piano Girl), both are members of the forums.
And remember, "charity begins at home" :-)
Piano World is my only job now, I didn't plan it that way, it's just the way things worked out after my "day job" was down-sized.
Don't get me wrong, I enjoy the flexibility and like having more time to play, and to meet up with members. However I also find I have to pour most of the money Piano World brings in (from advertising, and from our online store), back into supporting Piano World. And believe me when I tell you I took a substantial cut in pay (further exacerbated by my divorce, but that's another subject).
Realistically I doubt our book would be on the top of the NY Times best seller list, but let's not be in too much of a rush to give away the proceeds should it come to fruition :-)
BTW, we lost money on the CD project. I don't know if I still have the boxes I had left over, but I'm betting member Ax does and he'd be happy to sell them as he invested his own money in the production.
Not trying to discourage anyone, I think it's a wonderful idea.
I've often thought about writing a book about the "Piano World".