Also Sky would be cheaper if everyone who watched illegal steams either actually paid for the service or bought the 24 hour Now TV pass for the games that they want to watch.
No it wouldn't.
Yes it would.
Much like how all high street shops account for stolen items, Sky will be aware of the cost of the illegal streams and will adjust accordingly, even if it would only be a small difference in the monthly bill, it would still be there. Sky are an incredible company and I admire them nearly as much as the BBC.
Originally the price may have been set by factoring in an amount for illegal streams but if they were all stopped the prices wouldn't come down, it's not something companies do. Profits fell last year and they still made £570ish million. How much profit does a company need to make before reducing prices to their viewers? It won't happen. Spending £4.1 BILLION to show the football is driving prices up, and will drive more illegal steams. As someone else mentioned, don't pay TH14 silly amounts to do the same as whoever was doing it before them.
You also have to take into account that a lot of people that download it simply wouldn't bother watching it at all if they had to pay for it.
I have nothing against Sky but I do disagree about it being cheaper if people stopped streaming it.