Not necessarily. It comes down to a few things:

  • Quality of the design and manufacturing of the original equipment
  • The amount of use of the piece of equipment you are considering
  • The lifetime maintenance of said piece of equipment

A less than stellar camera will usually have poor reliability.
A well used professional camera that has been maintained properly will continue, generally, to perform well if the maintenance is kept up.
A well designed camera that is a closet queen will need a CLA to start with. How it runs after that, there are no sure bets.