Do I have to pay more to have EDYE on more than one device?

The short answer is NO!

Once you have subscribed to EDYE, you will be able to enjoy its content on up to 5 devices simultaneously at no additional cost. You install the application on your tablet, mobile phone, and on your Apple TV or Android TV at the same time without any cost additional to your subscription. And the exciting news is that Edye will be available very soon on Roku, Amazon Fire, and Samsung TV.