Don't be a tool. Just pay for it. It's been available on DVD for years now, is available on HBO Go, and is now available on Amazon for non-subscribers, and has already been available for non-subscribers on iTunes for years.
HBO's business model is exclusivity, which in my opinion is anti-consumer.
Then don't watch.
If everyone without an HBO subscription refused to watch GOT then HBO might actually be inclined to re-examine their subscription options.
Market pressure is already pushing HBO towards a non-cable option, they're just moving into it kicking and screaming because the current way has been immensely profitable for them.
As for your Ferrari example, some day it will be trivially easy to 3D print a Ferrari and we'll be going through the same thing with physical items as we are going through with IP today.