Never answering an asked question goes along the same line as no mutual mystification or not spilling you candy in the lobby.
What I mean by that is that as sales person you don’t want through a bunch information and hope that it answer the costumer’s questions.
Now a days costumers know exactly what feature they want in a product and most feature that you product has.
So you want to ask the client what sort problem they are trying to resolve and what their budget is. the problem of the client is never real problem. So you want to act like a consultant. Because the best sales presentation you will ever make the costumer will never see which is helping the client discover their pain.
Then you may revile you product if you think it would be suitable.
Allow the costumer to make his or her mind. Don’t ask for the order.