Certainly everyone's individual scenario may be a little different which is why it's >1% is a rule of thumb and not hard fact.
Time remaining in house/in mortgage, current rate (fixed vs variable), closing costs/origination fees, etc. etc. all matter in the calculation. Not to mention what eski said, do you want money tied up in a house or free for investments (I purposefully did not say "other investments" as a primary home is absolutely not an investment).
Not exactly. Paying off the house was an investment that lets us live rent free. Low overhead is key to middle class retirement.
