This is one concept I have trouble wrapping my mind around. The principal/interest portion of my mortgage is about $1942/mo, so close to that. I can understand the concept of no debt, peace of mind, etc.
But where I tend to balk is the idea of more money to invest. While it would be nice to have that $1942/mo available to invest or do whatever, it would cost me about $448,000 of money that's already invested, to free up that money.
So the way I look at it, I'm trading $448K in money, that can be invested, just to free up $1942/mo? I could just take the $1942/mo out of the $448K.
I guess, once the mortgage is toward the end of its life, it might make more sense to just pay it off. So where you are, in the mortgage cycle might also play on your decision to pay off or not. And, naturally, the higher the interest rate, the more incentive I could see.