@GreenWeaver -I know what you mean. I have to say that when salespeople apply pressure to get me to buy something, I never go for it. They tell me that the item will not be there tomorrow or the price is only good for today. I always tell them that I need to think about it and I usually get a better deal.
So in these situations, it is better to think things through before you purchase something that you might regret. A cooling off period will make you understand if the item that you are considering is worth the purchase.