Hmm not really, I’d say out of all the aircraft produced 737 parts would be in the greatest abundance. There are loads of them being parted out all across the world.
I see your point but I maintain my argument – lots of 3rd world operators are flying 4th or 5th hand planes that are poorly maintained, therefore need parts often, therefore parts from a well maintaned aircraft are in high demand. There were lots of first generation 737-200 produced but the condition of them now means high maintenance. Remember the 737-200 differs quite significantly from the 300/400/500 series.