Sorry, I assume everyone here is a woman if I'm not familiar with their posts.
I can picture it now a customer comes in looking for a red dress for an upcoming event and asks for your help. You go about your work, finding her many options to choose from. She asks for your opinion on which you would wear and your response would be "I'm sorry I'm not allowed to answer that until I punch out a 5:00, thats personal business and it is in no way permitted here while I work. I can give you only facts about your garment, but under no circumstances may I give you any of my personal opinions. If you would like me to share that with you, meet me in the parking lot at 5:15" Of course the woman thinks your a psycho and decides her pretty red dress is not worth what could happen in that parking lot. She puts the dresses on the counter and quickly hightails it out of the store and you lose the sale. Looking back, its really too bad your store has such a stringent no personal business on company time policy, they could have had a $100 sale and you could have gotten your 5% commission.
Joking aside, I don't buy it when someone claims they have never done anything personal on business time.