Sticking to the theme of on their level..... you would also want to think about how you would feel if you wanted a laptop. You would want to have the full knowledge of the product, and not have someone pretty much say.... "Well you can buy this now it is well worth the buy!!!!!!!" While leaving out critical information such as, "Well the model itself is about a year old and a new update is not far away." To only have them but the computer and maybe find out later, "Yea, you could have waited and have a newer model for the same price. Yea, I left that information out because I did not feel the need to tell you while I sold you an old piece of equipment."
Withholding information is dishonest and is not good for business. If they are asking, yes you may know more than them but that doesn't mean you have the right to not give them the full information. After maybe knowing that the new computer is coming out, why would they buy this one now?? If they can get the new computer later for cheaper after the newer one is out ... or get a newer one for pretty much the same price.....
Impatience would be a key factor in buying now without waiting... some people take great pride in this...

But, having all the information first is better. Why buy a product you know little about??
I hope you aren't in sales. I am staying away from your store.