Versatility.
Depending on what you want you can find it in Wisconsin.
Lake Michigan. I love our lake and the area of Wisconsin we live in the most. It is between Milwaukee, and Chicago with Madison close by. So much is within a short distance to do from big lakes, small lakes, tons of shopping, family life. It's here in this area.
Education? Many great colleges. Madison, Milwaukee etc.
Good family Living. Madison area ranks near the top for family living.
Wisconsin as a whole, offers so many places to go for fun, depending on what you want to do. Night life, large cities, shopping, culture, or adventure, remote camping, hiking, rafting, fishing, it's all here within our state.
Beauty of Wisconsin Dells, the upper Wisconsin cliffs, the light houses of Door County, Mississippi River on the West. Small lakes, large lakes. Wild life, prairies, the list goes on in Wisconsin.
Weather? Well, I am not totally fond of the winters here but I do like the changing of the seasons in Wisconsin or at least the beauty of each one. I could definitely live without the harsh cold, the deep snow, and ice. But it's better than immense heat, huge bugs, hurricanes, etc. of some of the southern states.
I stay also because I grew up not far from Wisconsin (just across the state line in Illinois) and this is home to me and family is close by. If I had any other area of which to choose to live I would go West towards South Dakota, Idaho, or Washington state.