Glowforge Plus/Pro machines are premium desktop laser cutters used by makers, small businesses, and classrooms for cutting/engraving wood, acrylic, leather, and more. The biggest long-term cost drivers are laser-related components and airflow management: optics (lens/windows) can get contaminated, cooling and exhaust fans can fail, and the laser source/power supply can degrade with heavy duty cycles.
Repairs are often worth pursuing because the machine's productivity value can be high when it's a revenue tool; replacing consumable optics, fans, or sensors is usually economical compared to replacement. Replacement starts to make more sense if the laser source fails outside support options, if there's repeated overheating or smoke damage, or if the unit has chronic connectivity/control issues that halt throughput.
For business users, consider downtime costs and whether a repair restores dependable daily operation.