Spitting Cobra do produce a high yield of venom. But the venom serves two purposes; one is to kill prey, and the other is to act as a defence mechanism, and that is where the ability to "spit" comes in. Venomous snakes would rather flee than bite as a defense. Biting puts them in close proximity to their attacker, which puts them at risk, and wastes venom. Once the venom has been spent, it takes a while for the venom sacks to fill back up.
This is the upside of the downside of working with Spitting Cobras, as although the "spitting" is an extra hazzard, there is a possibility that if you do get bitten, the yield of the bite may be relatively low or even a dry bite if your really lucky.
It is noteworthy that the African Spitters are the more evolved and efficient at "spitting", the Asian Spitters are less evolved and effective.
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