Since that time the technology has developed into custom molds of the musicians ear. 1964 Ears is one company that develops these. Here is a video to give you an idea of who they are and what they do.
These can be used by professional musicians or just people that are really serious about the music they listen to.
My question is this. Considering how much money people will spend for "Beats by Dr. Dre" and other brands of headphones that can cost over $300. Do you think people would spend the extra money to get in ear monitors that are better quality and are molded to their ears?

