Has anyone of you written an ebook?

I'm wondering if any of you ever created an ebook and sold it somewhere.
I for myself am not a big fan of ebooks. Everyone knows, 99% of these monetizing ebooks don't work and it's a waste of money. The only one who's making money is the one who's selling the ebook.

I've written one ebook in my life so far, which was about "How to start a successful forum". I've earned about $700 within two weeks with it and people seemed to like it.
I'm currently in the progress of writing a new ebook which will be HTML based thus having a very nice look and a better reading experience.

What about you?