It's like going to the dentist for a check up. Preventative maintenance.
Some people believe you don't need to go to the dentist for that work and hence forth, the appearance and functioning of that piece of equipment eventually becomes a train wreck.
Dentistry on demand I think it's called.
Unfortunately however, with such a system, inevitably major root canal work is the end result and the false economy and argument that it's the better way seems to be a ridiculous notion.
But I guess if you earn $33000 per day, you can jump the queue and sit in any dental recliner chair you want, whilst you wait for the rectification to be complete.