Nobody is suggesting winter tyres aren't an advantage in snow.
Merely, that we don't get enough snow to warrant them. Sorry, we just don't!
Not just snow 
yes just snow. Unless I spin off into a muddy field of course. 
Sc3 in cold weather perform better than your autocraps do all year round. 
Not sure if you are reading any of the posts? It is not snow that matters. The summer tyre rubber hardens below 7 deg or so to the point that it is not suitable for the job it was designed for. I am sure you are aware of black ice as well. You just need to be below 4 deg C for that to happen.
The silica component of winter tyres are much higher, meaning that they remain soft supple and grippy even below 7 deg C. Hence more grip. If grip wasnt important to you, then why use SC3's. Might as well use some Sunnys or enduros or Autogrips or something cheap and Chinese.
Now dont tell me that between Nov and March, out temps are well above 8 deg C. I didnt think so. Hence the point I am trying to make. It is difficult to say that they are not required unless you have really used them. As I said before, I used to be a non-believer as well, till I tried a pair. No, not in Iceland, but in good old England.
Lastly the winter tyres perform similarly to summer tyres in the pricing department. i.e. cheap winter tyres are crap. Something from the Dunlop/Conti/Bridgestone/Goodyear product lines perform really well.