With a high enough skill you can make the mind melt poison, which is used for tainted avalanche ale (ring 9). But I believe that the mind melt poison is tradable (or the tainted ale MQable) so you really don't need the skill to complete the quest at all.
Other than that, there are a few poisons that are good in PvP, stuns/snares etc. And i suppose making poisons is just kinda fun (maybe?)
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