First of all, congratulations on no mortgage.
Sadly, you will eternally be renting your house from the government in the form of taxes.
As far as the "investing to make money and don't pay off your house" theory is not for me.
I have been investing like a 90 year old trapped in a 70 year old body. I don't mind if I don't make money, but I do mind losing it.
Just me.
Paid off my house 10 years ago.
762.