for a few reasons:
a) snow is ****ing awesome. we get to go skiing/snowboarding and snowmobiling.
b) the summers would be unbearable to us in southern states. oh my, my hatred for days over 75* is very great.
c) cheap liquor? check.
d) cheap everything? check.
e) lots of land to expand when you get sick of 'city' life? yup.
f) more, but i aint got that kind time. cause people from wisconsin are baller.
g) oh yeah, it's not illinois.