It was unusual, those with unusual skills needed studied. He wasn't this successful in his job without paying attention to potential obstacles. Some he could work around, others needed more of an eye kept on them.
Seeing auras was an area he had little expertise, he needed
To be fair to all beings he was around, Spraggins was always in a constant state of nervousness. It was where he was most comfortable ironically enough. Especially when meeting with a new client as it were.
Of course his name had been circulating around ~