I pay £55 a month for the full package, multiroom, the 2TB UHD box (with UHD channels) and I love it. The picture quality is also miles better than anything streamed, even if both claim to be 1080p or 2160p for 4K. I think £55 for all that is worth it and just treat it as a household bill like Energy, Council Tax etc.
It's always worth waiting for Sky to throw out their 50% off deals, as for me it makes it worth it. My package would be £110 without the offer and for me that crosses the line.
Mate of mine cancelled his the other week and got a 75% off code through the post for the full package.