Tell me that when your alternator and vacuum goes awry on a solid IFR day Peter.
Replacing bits on a pure time basis is in most cases in fixed wing GA totally pointless.
A bit of a contradiction there, dont you think?
Being an owner is just about the only way that you can fly a plane that's maintained to a high standard, with a zero tolerance to defects. It is not economical for a rental plane to be thus maintained, unless it is an extremely simple type.