Why do I live in 2 countries?

In the eyes of the law, I don't live in 2 countries. I live in the US as I am a US citizen. While in Canada I'm there as a visitor. The purpose of my visits to Canada is that I'm married to a Canadian citizen. People often ask why I don't immigrate to Canada or why doesn't Meg immigrate to the US? Both of these options are available to us. However for several reasons we don't do either. I gain nothing by immigrating to Canada other than the right to work there. I'm retired, so that's not an issue. Meg is still too young to retire, so she continues to work in Canada. As visitors, we both can spend up to 180 days in the others country. Having family in both countries we would never spend 180 days in one or the other country without crossing the border to visit family. Upon return the 180 day cycle begins again.
So being a visitor works out quite well at this time. Managing banking and other financial matters can be an issue at times, but we've managed to work within the constraints. I only wish the two countries would give the freedoms from border restrictions that NAFTA has given commerce.