seanws got it right there. The company wants to make sure that the customer has an equal chance of getting the item as anyone else. If you were to put it on one side, they don't benefit. They may lose a customer. You on the other hand, would be someone they expect to shop there, because you'd have your employee discount.
I'd say, go ahead. Who are they to limit what you buy? And if they ask, say you are buying presents, or buying to give to the poor kids, that always works 😛 Also, use your employee discount! More profit that way.