As I understand it, the SA job is not a skilled one. Meaning they hire and fire people as neccessary. And a lot of SA's find better jobs and leave or more within the department store to other sections like shoes or clothes because the commission is obviously higher there.
So a lot of the SAs will only know whether the perfume is woody, fresh, floral or spicy. Which wood did you say? Ahhhh woody. What flowers? Mmm the usual flowers.
Time to pull out my iphone/ipad.
Also, they only send committed SAs to training seminars and I think you need to exert way too much effort in the job to be able to qualify for the training sessions, than the salary is worth.