It's all about the miles left on the car, really. If you would drive the car another 5 years/60k miles, then sure it is worth it. If you don't like the car and don't mind having a payment or shelling out 10k for a new car (with new, yet unknown problems) then sell it. No one in my neck of the woods will buy a car without working A/C, but perhaps you won't have that problem?
I had small and intermittent leak for years that I concluded has to be evaporator and in desperation put sealer into the system. That was last year and I did not add refrigerant since.
No offense, but $1500 car is not worth $3000 repair. Unless you have the car in pristine condition and are hoping they become collectible.
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