Too funny. One of the reasons given for using rims was cost and convenience.
So, You're talking about $50 per rim for valve stems.....so that's $200 there, plus the rims....all to save, let's see: around here, for a 4 tire change/balance, it's $49.95. So, you spend $200 plus the four rims, in order to save $50, twice a year for...how long do you keep your cars? I keep mine for 8-10 years, but how long would a set of tires last anyway?
There seems to be only one real reason to have a set of winter rims: to keep your alloy rims out of the crud.