[evanm]

My iPad was a one-time purchase and Comcast doesn't have a problem with me streaming HBO Go content on that. So why the Roku?

[Ricapar]

Is your iPad permanently hooked up to your TV? Many people have rather large HDTVs and would much prefer to watch on there rather than on a tiny screen you have to carry around or dock somewhere.

[stonemetal]

Comcast doesn't sale or rent iPad competitors so they don't feel the need to cripple the iPad.