There are several reasons. There are many different grades of hair and this is crucial to you having a good or bad experience. The highest grade/level virgin remy human hair is very expensive. There is a lot of hard work time and effort that goes in to ensuring the beauty and life span of the hair. There are mid-low grade/level virgin remy that are less expensive but are lacking the quality, beauty and the life is short lived. Then there is non remy which is a waste of money. There is also synthetic clip ins just for a night out.