One of my favorite things about snowy, icy, windy, cold days.... is not leaving the house (or my pajamas!). Working from home is one of the best things that has happened to my career since I quit my job and joined the ski patrol over at Loon Mountain! (Of course the ski patrol did nothing for my actual "career", but it was a blast while I was there!) I have heard a handful of people express that they would get nothing done if they worked from home. I think, when your livelihood (and capacity to pay the mortgage) depends on getting things done, the motivation shows itself. For me, I've never had trouble getting to work. Often it is the opposite!
It is not just the "pajama factor" that makes telecommuting so attractive either. Taking one more car off the road is always a plus...