2p - No, I'm saying that ejecting a heavy snap cap will put a lot of extra stress on the extractor/ejector arm. There is a pretty significant stress area between the stem (long arm of the "L") and the side that engages the shell rim (short arm of the "L"). When the hull/snap cap is ejected, the force is manifested in bending at this location. The more cycles of ejecting the more likely the head is to break off the stem. The more severe the bending (heavier the load) the fewer cycles to breaking. Extraction of a stuck case would be similar - bending at the juncture of the "L" legs.
Ejection of fired hulls and normal extraction should be OK for many, many cycles.
