One thing I came to realize from my training experience is that there is no limit to the possibilities offered by Reiki. As demonstrated by Usui Sensei, Hayashi Sensei and Takata Sensei, Reiki is something that is meant to be developed. This is true for the techniques one uses to practice Reiki, but it is also true for the quality of the healing energy.
Reiki energy comes from an infinite source and because of this, regardless of how developed and evolved ones healing energy has become, one will always be channeling only a small portion of the potential healing energy that is available; it is always possible for the quality, effectiveness and benefit of one’s healing energies to improve and this includes what takes place in the Attunements, Placements and Ignitions.
Usui Sensei alluded to this when he said he wasn’t at the top of the Reiki healing system, but one step below.(34) It is also important to note that according to the Bible, Jesus, who is considered by many to be a great healer and spiritual master, said that we could do everything he had done and even more.(35)
Reiki Continues to Develop
Takata Sensei required all the Masters she trained to charge a fee of $10,000 for the Master level. She taught that this was a required fee, and if you did not charge this fee, then you would not be teaching Usui Reiki. The fee wasn’t based on the length or quality of training she provided, as no apprenticeship was included.(36) The actual length of her Master training has not been documented by any of her Masters, except for Bethel Phaigh, who reported receiving both Level II and Master within a few days.(37) However, my conversations with a few of her Masters indicate in at least some cases her Master training lasted only a few days. According to Phagh, the high fee was to instill respect for the Master level. However, the high fee, along with the tendency of Takata Sensei’s Masters not to teach many other Masters, was causing Reiki to spread very slowly.
Iris Ishikuro was one of Takata Sensei’s Master students and Iris also had other training as a healer. She was involved with the Johrei Fellowship, a religious fellowship that includes healing with energy projected from the hands.(38) She had also learned another kind of healing from her sister, who worked in a Tibetan temple in Hawaii. After Takata Sensei passed in 1980, Iris decided that she would follow her own inner guidance and teach for a more reasonable fee. As far as I know, she was the only one of Takata Sensei’s twenty-two Masters who did this. The others continued to charge the high fee for Mastership.
Iris trained only two Masters. One was Arthur Robertson and the other was her daughter, Ruby. She asked them to always charge a reasonable fee. Ruby decided not to teach Reiki. However, Arthur Robertson did begin teaching in the mid-1980s. The reasonable fee allowed many more students to become Reiki Masters. He began giving Master trainings with ten to thirty students in each class. Those that Robertson taught trained others and the number of teaching Reiki Masters quickly increased.
Because Iris Ishikuro ignored the price restriction that Takata Sensei had placed on Reiki, she became the pathway through which Reiki would spread more quickly and eventually be passed on to people all over the world. In light of this, it is likely that the majority of Reiki people in the world have their lineage going back through Iris Ishikuro.
Arthur Robertson had also been a teacher of Tibetan shamanism and had learned a healing method that made use of several symbols and an attunement-like technique called an empowerment. This method had similarities to Usui Reiki. After becoming a Reiki Master, he developed an alternative method of Reiki that was a combination of the Tibetan style of healing and Usui Reiki. The parts from Tibetan shamanism were the use of two Tibetan symbols—with one being used as a Master symbol—and the Violet Breath. It also incorporated the use of the three symbols from the Okudenlevel of Usui Reiki. He called this system Raku Kei.(39) Robertson taught both the Takata-style Usui system and Raku Kei, teaching them separately in different classes.
Source: https://www.reiki.org/faqs/what-history-reiki