Our experiences are nearly mirror images. I cancelled cable TV years ago. When Game of Thrones came out last year, I naively thought "No big deal. I'll just pay HBO for streaming." I was shocked to discover that there's no way for me to upend my wallet into HBO's coffers without funneling it through Comcast and buying multiple tiers of garbage that I care nothing about.
I waited a year and bought the blu ray version, but I still can't understand why HBO wouldn't prefer to get their money earlier rather than later.