It’s propaganda to generate more commissions. They think that if enough of them say this to enough people (over & over), it will become something that people will accept as normal. Unless your need more room and can’t enlarge your present home or the neighborhood turns very bad……or you change jobs and your commute starts beating you to death, stay in that home and pay off the mortgage. There is no better feeling than having NO mortgage (despite what all the other people who want you to invest their money with them will tell you).
