I have seen people easily getting influenced by sales people and jump to conclusion that the person selling the product is actually helping us. In fact in most of the cases they are doing their job which is to make maximum benefit for the company they work for. Usually they may inspire us to buy products that give them high margins. So I think the best strategy should to listen to them but never trust them blindly. We have to make our own decision based on our budget and requirements. How often do you end up buying products based on the recommendation of a sales professional?