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.