Continual maintenance is a philosophy in search of an application. To what degree? At what costs? For how long? By what methods? A general rule is that maintenance should be a small fraction of purchase cost--i.e. a tank of gas is worth less than the car. Accumulated tanks of gas can eventually cost more than the car, but that merely demonstrates how the car is not a source of value unless it is moving people and things around.
Eventually, the most useful thing becomes an artifact. At that point, it may have achieved artistic value, but at what cost? Is it in the way of something better? Portable objects can retain value for as long as they exist. Architecture and infrastructure need to be assessed frequently. Much is found wanting.