I agree with Rivkin.
There may be some psychological undertone: Persians were losing one war after another and were much better swordmakers than swordwielders. Perhaps, as a compensation, they tended to exaggerate their past military glories, exploits of their national heroes and the grandiosity of their weapons.
I have a strong suspicion that these giant Qamas were just an equivalent of "mine is bigger than yours". I also do not think these things were used for self-mutilation at Ashura festivals. The scalp wounds were in a large measure for show: bleed a lot but heal fast. With the giant Qama one could inadverently inflict some real damage.....
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