This store sells only cot mattresses

When a person or a company sells only one type of products you trust them, don^t you think? That is because they are not like other people or stores selling all types of product which are not connected with each other in any way. That is frustrating if you ask me. On the other hand we perceive this person dealing with only one type of product as someone who is an expert in this discipline. We know that we can ask him for help and that we will get a reply that is good for us and teaches us something about the problem that we wanted to solve. Let me give you an example from my life. There is this store with cot mattress. What is special about it is the fact that it sells only those products and nothing else. They specialize in cot mattress and that is why I like to buy them there. There are only cot mattress of high quality and I am sure that if I buy something there it will be used by me for many years and not only for few weeks. Do you know what I mean? My advice for you is to always look for stores selling only one type of product and to contact with experts of one particular discipline. Not people who believe that they know everything about anything.