Ya I would not let the MPAC come IN to my house either .... my understanding is they are accessing the property to determine how much city services the property might require and so forth to determine the value of the PROPERTY aka land based on square footage and going rate of homes in area and they can get all that from the outside of the home based on the public records for the amount of electricity and sewage used in this neighborhood and real estate statistics so there is no need to be IN my house at all ;)
Now for my INSURANCE I chose to allow the adjuster to make an appointment to come to the home to do the appraisal to insure we had enough coverage for the replacement value of the home and replacement value of the 'content' and so forth ~ if I had refused to cooperate with that inspection I likely would have found myself without insurance carrier.