Your response show a lack of understanding about what the real uses of a 3d printer are. The maintenance is worthwhile for the actual use-cases.

Think instead of: A one-off part for a one-of-a-kind car whose parts are no longer made. A chair with the exact outline of my buttocks. A replacement part for a custom-made machine. A life-size doll that looks like me. A prototype of my new widget, which I tweak repeatedly until the production run. Think customization, one-offs, personalization, and bespoke design.