Having worked in the industry, I'd say very little of it. An $80 ebook is almost all profit. If you can write/edit your own copy, your costs are typically a dom

Having worked in the industry, I'd say very little of it. An $80 ebook is almost all profit. If you can write/edit your own copy, your costs are typically a domain reg, super cheap hosting and whatever cut your payment gateway takes. It's much more important to have a good reputation than make a few dollars off of an email address. That good rep means more testimonials, which leads to more consumer confidence in buying from your website.