Grades vary from place to place because the ordinary grades of routes for the outdoor cliffs can attract climbers of various ability levels. If a gym has voluminous routes that area simple but is over ranked it will attract a lot of newbies or the climbers that at an initial stage as it is less discouraging. Whereas gyms with tougher and sandbagged routes can attract stronger and skilled climbers. So grading can also be helpful in attracting the people who want to join the climbing clubs.