Apparently a lot of people do!

http://en.wikipedia.org/wiki/Roof#Drainage

The high steeply-pitched roofs of Germany and Holland are typical in regions of snowfall. In parts of North America such as Buffalo, USA or Montreal, Canada, there is a required minimum slope of 6 inches in 12 inches, a pitch of 30 degrees.

This makes me think of the university buildings in Wisconsin with flat roofs that need snow removal periodically to prevent structural collapse. I still can't believe they spend millions on buildings and can't be bothered to find an architect who knows what snow is.

Not sure how far you can practically get with that -- I've seen some rather steep roofs have a lot of snow build up. It's generally accepted around here that roofs have to be shoveled (or otherwise cleared off).

Yes....my next home will be a chalet.