The real point
Reading the posting, I think people are missing the real point here.
It says he paid £19.95 to watch the fight with four pals. ONE OF HIS PALS decided to stream it on facebook. So, this guy didn't actually do the streaming. Now, this leads to an interesting issue. Is it his responsibility to ensure nobody streams it? Would he necessarily be aware they were doing it? What if someone streamed it using a camera outside his window, maybe in a public place looking in. The fact his subscriber number or whatever was showing isn't really relevant. The offender is the person streaming it, not the Sky subscriber, unless they are one and the same.
So, why not go after his pal?