I still don't follow. As market rent goes up you will be renting to yourself below market rate. Suppose market rent is $2000/month and my mortgage is $2000/mont

I still don't follow. As market rent goes up you will be renting to yourself below market rate. Suppose market rent is $2000/month and my mortgage is $2000/month. In 10 years market rate rent has gone up, but my mortgage is still $2000/month.