They work alot like PayPal and are specifically for adult market. Alot of webmasters that deal in adult products and services are starting to use them so having the ability to accept payments via their accounts can be a benefit.
My suggestion to you would be to totally outsource everyhting to a 3rd party like a DHD Media. The profit margins may not reach their full potential but they will handle every aspect of running your ecommerce site, all you have to supply is the product. AE is a tricky business, one second you could be on top, the next you're up to your neck in fraud.