I'm not a big fan of ebooks, and to be honest, I think that stuff should stay on HF. We should stick to making tutorials, guides, and other stuff like that, and posting them in the section we already have.
Not really. Mostly all eBook sales would go through paypal, and of course, be checked by staff or someone trustworthy to make sure they are safe and legit. We don't have a huge system to prevent scamming stuff like RS accounts and gold, do we?