Is there an endurance cost for specialty skills like Sense Impurity?
Remember, only manipulative psychic skills have an END cost. Sensory skills don’t. Also, keep in mind that many special skills are not psychic at all, or are only marginally psychic (take Sex Workers’ Bad Trick Sense, it may involve some small amount of ‘human intuition’, which may be partly psychic, but 99% of it is just experience).