HBO Go

Why can't you just buy HBO Go?  The Atlantic gives an incredibly good breakdown of how cable companies work and how HBO basically has to "take one for the team," because bundled cable is a cash cow and single channel streaming would kill it.

All of this is a tough call - is HBO able to make big hits like Game of Thrones only because it has the deep pockets of NBC-Uni in the first place?  Would HBO be advantaged by "going at it alone?"  Or would one or two big risks blow up the place?  These are actually really relevant and difficult to know questions.