I have met some people who have become blinded by what they think they have, as to what they really have. Unfortunately, being human we come with prejudices and bias. These two traits affect different people different ways. When I look at a sword, I try to be as objective as possible. When I look at a sword, I begin with the cons rather than the pros. This prevents me from becoming too excited and I begin to weigh the cons against the pros, including future sales. I never buy a sword with the view, that I will keep it forever. There are factors, such as "Trading in", or maybe to raise some cash, that I take into account. The point I'm really trying to make is, I know people who believe they can research a sword fairly well and become shocked, when told by Shinsa that they have something completely different. I have seen swords with polishers papers, that receive something completely different at shinsa. I have seen swords submitted to both NTHK and NBTHK and receive totally different attributions (mumei). I also have seen Gimei swords submitted where people are astounded they are Gimei. There are just so many factors in sword appraisal, that makes collecting so interesting.