So, do you really think a salesperson, working for min wage or just above, is really knowledgeable of anything? They are not paid to know there product, just to sell it. Just because they can stand behind a counter and possibly be trusted to make change from your purchase does not endow them with any product knowledge.
Many Moons ago you could buy windshield wipers without knowing what engine and transmission was in your car. Only occasionally do you come across someone knowledgeable about the products they sell.
Yes, steeping is required on some juices but not all. My rule is buy it, try it. If it's good go with it, if not check back next week.