Adding fuel to the fire:

If you are riding on 214's, Tire Rack shows the Pirelli Scorpion Ice & Snow RFT available for $1,400/set. Add in $400/year ($200 per tire change) for mounting and balancing. So total cost over 3 winters of $2,600.

OR you could get Pirelli Scorpion RFT's on 18" Moda EB1 wheels, mounted and balanced for $1,500/set. Never have to break down those 214's unless / until you wear out your summer tires. Do the changeover yourself in your own garage, during halftime of a football game. Better resistance to pothole damage, arguably better traction in snow and ice, total cost over 3 winters of $1,550.

And at the end of 3 winters you can probably sell the rims for $50 to $75 each. What's not to like?

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2011 X5 35D Deep Sea Blue / Oyster
2008 M3 Vert Silverstone II / Black Novillo, 6MT
2008 X5 3.0 Platinum Bronze / Sand Beige Dakota
2007 X5 3.0 Space Gray / Gray Dakota (Retired)